diff --git a/assets/materials/commons.json b/assets/materials/commons.json
new file mode 100644
index 0000000..00103cf
--- /dev/null
+++ b/assets/materials/commons.json
@@ -0,0 +1,26 @@
+{
+  "material_flags": [
+    {
+      "metal": {
+        "conducts_elictricity": true,
+        "blocks_liquid": true,
+        "acid_resistant": true,
+        "blocks_gas": true,
+        "flammable": false,
+        "conducts_heat": true,
+        "radiates": true
+      }
+    },
+    {
+      "wood": {
+        "conducts_elictricity": false,
+        "blocks_liquid": true,
+        "acid_resistant": false,
+        "blocks_gas": true,
+        "flammable": true,
+        "conducts_heat": false,
+        "radiates": false
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/assets/materials/metals/metals.json b/assets/materials/metals/metals.json
new file mode 100644
index 0000000..32e17de
--- /dev/null
+++ b/assets/materials/metals/metals.json
@@ -0,0 +1,28 @@
+{
+  "materials": [
+    {
+      "steel": {
+        "name": "steel",
+        "material_flags": {
+          "$ref": "#/material_flags/metal"
+        },
+        "density": "7800",
+        "fracture_toughness": "30",
+        "melting_point": "1400",
+        "boiling_point": "3200"
+      }
+    },
+    {
+      "iron": {
+        "name": "iron",
+        "material_flags": {
+          "$ref": "#/material_flags/metal"
+        },
+        "density": "7800",
+        "fracture_toughness": "12",
+        "melting_point": "1400",
+        "boiling_point": "3200"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/assets/materials/misc.json b/assets/materials/misc.json
new file mode 100644
index 0000000..a2ac6dd
--- /dev/null
+++ b/assets/materials/misc.json
@@ -0,0 +1,15 @@
+{
+  "material_flags": [
+    {
+      "acme-fiber": {
+        "conducts_elictricity": false,
+        "blocks_liquid": true,
+        "acid_resistant": true,
+        "blocks_gas": true,
+        "flammable": false,
+        "conducts_heat": false,
+        "radiates": false
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/assets/materials/wood/wood.json b/assets/materials/wood/wood.json
new file mode 100644
index 0000000..9ba017d
--- /dev/null
+++ b/assets/materials/wood/wood.json
@@ -0,0 +1,16 @@
+{
+  "materials": [
+    {
+      "oakwood": {
+        "name": "testoakwood",
+        "material_flags": {
+          "$ref": "#/material_flags/wood"
+        },
+        "density": "700",
+        "fracture_toughness": "4.5",
+        "melting_point": "600",
+        "boiling_point": null
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/engine/items/itemprops/body.go b/engine/items/itemprops/body.go
index 96a10d3..a723133 100644
--- a/engine/items/itemprops/body.go
+++ b/engine/items/itemprops/body.go
@@ -84,6 +84,7 @@ type BodyPart struct {
 	LayerMiddle MedicalMaterial
 	LayerInner  MedicalMaterial
 
+	Size     DimensionItemSize
 	Joints   []Joint
 	Contains []InnerOrgan
 	Exposes  []OuterOrgan
diff --git a/engine/items/itemprops/ip_test.go b/engine/items/itemprops/ip_test.go
index 35e720a..a0a9655 100644
--- a/engine/items/itemprops/ip_test.go
+++ b/engine/items/itemprops/ip_test.go
@@ -2,9 +2,13 @@ package itemprops
 
 import (
 	"encoding/json"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 	"github.com/shopspring/decimal"
 	"github.com/stretchr/testify/suite"
+	"os"
 	"testing"
+	"time"
 )
 
 type IpTestSuite struct {
@@ -173,3 +177,32 @@ func (suite *IpTestSuite) TestMaterialSerialization() {
 		string(bytes),
 	)
 }
+
+func (suite *IpTestSuite) TestMaterialDeserialization() {
+
+	logger := log.Output(zerolog.ConsoleWriter{Out: os.Stdout, TimeFormat: time.RFC3339})
+	mm, err := NewMaterialMap("../../..", logger)
+	suite.NoError(err)
+
+	metalMaterialFlags := MaterialFlags{
+		ConductsElictricity: true,
+		BlocksLiquid:        true,
+		AcidResistant:       true,
+		BlocksGas:           true,
+		Flammable:           false,
+		ConductsHeat:        true,
+		Radiates:            true,
+	}
+
+	teststeel := Material{
+		Name:              "teststeel",
+		Flags:             metalMaterialFlags,
+		Density:           DimensionItemDensity{decimal.NewFromInt(7800)},
+		FractureToughness: DimensionFractureToughness{decimal.NewFromInt(30)},
+		MeltingPoint:      DimensionItemNullTemperature{decimal.NullDecimal{decimal.NewFromInt(1400), true}},
+		BoilingPoint:      DimensionItemNullTemperature{decimal.NullDecimal{decimal.NewFromInt(3200), true}},
+	}
+
+	_ = teststeel
+	_ = mm
+}
diff --git a/engine/items/itemprops/material.go b/engine/items/itemprops/material.go
index b7c86a0..2e9565b 100644
--- a/engine/items/itemprops/material.go
+++ b/engine/items/itemprops/material.go
@@ -1,6 +1,17 @@
 package itemprops
 
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/rs/zerolog"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
 type Material struct {
+	Id                string                       `json:"id"`
 	Name              string                       `json:"name"`
 	Flags             MaterialFlags                `json:"material_flags"`
 	Density           DimensionItemDensity         `json:"density"`
@@ -9,6 +20,8 @@ type Material struct {
 	BoilingPoint      DimensionItemNullTemperature `json:"boiling_point,omitempty"`
 }
 
+func (m Material) Unmarshal() {}
+
 type MaterialFlags struct {
 	ConductsElictricity bool `json:"conducts_elictricity"`
 	BlocksLiquid        bool `json:"blocks_liquid"`
@@ -18,3 +31,79 @@ type MaterialFlags struct {
 	ConductsHeat        bool `json:"conducts_heat"`
 	Radiates            bool `json:"radiates"`
 }
+
+type MaterialMap map[string]Material
+
+type tt map[string]MaterialMap
+
+func NewMaterialMap(path string, logger zerolog.Logger) (*MaterialMap, error) {
+
+	mm := &MaterialMap{}
+	tmp := make(map[string][]interface{})
+	flags := make(map[string]*MaterialFlags)
+	err := filepath.Walk(path+"/assets/materials",
+		func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+
+			if strings.HasSuffix(path, ".json") {
+				splt := strings.Split(path, "/")
+				logger.Info().Msgf("loading %s %d", splt[len(splt)-1], info.Size())
+				bytes, err := ioutil.ReadFile(path)
+				if err != nil {
+					return err
+				}
+				ttmp := make(map[string][]interface{})
+				err = json.Unmarshal(bytes, &ttmp)
+
+				if err != nil {
+					return err
+				}
+				for idx, _ := range ttmp {
+					tmp[idx] = append(tmp[idx], ttmp[idx]...)
+				}
+			}
+			return nil
+		})
+
+	_ = flags
+	if lst, ok := tmp["material_flags"]; ok {
+		for _, item := range lst {
+			ttt := item.(map[string]interface{})
+			_ = ttt
+			for clause, item2 := range ttt {
+				bts, err := json.Marshal(item2)
+				if err != nil {
+					return nil, fmt.Errorf("Could not marshal back:%w", err)
+				}
+				flags[clause] = &MaterialFlags{}
+				err = json.Unmarshal(bts, flags[clause])
+				if err != nil {
+					return nil, fmt.Errorf("Could not unmarshal to material_flags:%w", err)
+				}
+			}
+		}
+	}
+	logger.Info().Msgf("loaded %d material flag sets", len(flags))
+
+	if lst, ok := tmp["materials"]; ok {
+		for _, item := range lst {
+			ttt := item.(map[string]interface{})
+			_ = ttt
+			for clause, item2 := range ttt {
+
+				bts, err := json.Marshal(item2)
+				if err != nil {
+					return nil, fmt.Errorf("Could not marshal back:%w", err)
+				}
+				flags[clause] = &MaterialFlags{}
+				err = json.Unmarshal(bts, flags[clause])
+				if err != nil {
+					return nil, fmt.Errorf("Could not unmarshal to material_flags:%w", err)
+				}
+			}
+		}
+	}
+	return mm, err
+}