Necklace piston. Suitable for both mass and single production. The model is divided for better polishing. STL files are tested and ready to grow. The original Rhino (5.14) file and FBX (in NURBS) is attached. The main dimensions are shown in the image. The total volume of the model is 172 cubic millimeters. The model is checked and there is a finished product in gold. Difference in piston rings, they were made by laser cutting. The SWG file is attached. The weight of the finished product (single) without a chain in gold 585 (14K) 1.8 grams.