diff --git a/src/ansys/api/acp/v0/fabric.proto b/src/ansys/api/acp/v0/fabric.proto
index f807f0f..c72d316 100644
--- a/src/ansys/api/acp/v0/fabric.proto
+++ b/src/ansys/api/acp/v0/fabric.proto
@@ -17,7 +17,10 @@ message Properties {
     ply_material.DrapingMaterialType draping_material_model = 7;
     double draping_ud_coefficient = 8;
     base.ResourcePath material = 9;
-    // todo: drop-off and cut-off material links (resource path)
+    // todo: drop-off and cut-off material links (resource path).
+
+    // read only properties
+    double area_weight = 10;
 }
 
 message ObjectInfo {
diff --git a/src/ansys/api/acp/v0/stackup.proto b/src/ansys/api/acp/v0/stackup.proto
index 1a41e76..b2b93b7 100644
--- a/src/ansys/api/acp/v0/stackup.proto
+++ b/src/ansys/api/acp/v0/stackup.proto
@@ -28,6 +28,10 @@ message Properties {
     base.ResourcePath drop_off_material = 9;
     cut_off_material.MaterialHandlingType cut_off_material_handling = 10;
     base.ResourcePath cut_off_material = 11;
+
+    // read only properties
+    double thickness = 12;
+    double area_weight = 13;
 }
 
 message ObjectInfo {
diff --git a/src/ansys/api/acp/v0/sublaminate.proto b/src/ansys/api/acp/v0/sublaminate.proto
new file mode 100644
index 0000000..4ac0a42
--- /dev/null
+++ b/src/ansys/api/acp/v0/sublaminate.proto
@@ -0,0 +1,53 @@
+syntax = "proto3";
+package ansys.api.acp.v0.sublaminate;
+
+import "ansys/api/acp/v0/base.proto";
+import "ansys/api/acp/v0/enum_types.proto";
+import "ansys/api/acp/v0/ply_material.proto";
+
+// Note: material can be of type Fabric or Stackup
+message Lamina {
+    base.ResourcePath material = 1;
+    double angle = 2;
+}
+
+// Note: draping and solid model properties are defined by the fabric and
+// stackup
+message Properties {
+    // general properties
+    enum_types.StatusType status = 1;
+    ply_material.SymmetryType symmetry = 2;
+    // topdown=True: the first fabric in the list is placed first in the mold
+    bool topdown = 3;
+    repeated Lamina materials = 4;
+
+    // read only properties
+    double area_price = 5;
+    double thickness = 6;
+    double area_weight = 7;
+}
+
+message ObjectInfo {
+    base.BasicInfo info = 1;
+    Properties properties = 2;
+}
+
+message ListReply { repeated ObjectInfo objects = 1; }
+
+message CreateRequest {
+    base.CollectionPath collection_path = 1;
+    string name = 2;
+    Properties properties = 3;
+}
+
+service ObjectService {
+    rpc List(base.ListRequest) returns (ListReply);
+
+    rpc Get(base.GetRequest) returns (ObjectInfo);
+
+    rpc Put(ObjectInfo) returns (ObjectInfo);
+
+    rpc Delete(base.DeleteRequest) returns (base.Empty);
+
+    rpc Create(CreateRequest) returns (ObjectInfo);
+}