This is an inner case for storing mini 4WD motors. It can store 16 x 2 motors. Made with a 3D printer. Layer lines are present from the manufacturing process. There will be some scratches from sanding due to the deburring process. The resin used is PLA resin. We are not responsible for any damages caused by using this jig. Please be aware of this. The product includes 2 motor cases. The S-sized case with a lid is not included.