These are parts for attaching a standard RS540 motor to the Tamiya 1/12 scale radio-controlled models "Porsche 959 Paris-Dakar Rally" and "Celica Gr.B Rally Special." They are used in conjunction with the original color (white). Reference video: youtu.be/kKOXsSOGiWg These parts are created using a layered 3D printer. The material is high-strength, heat-resistant ASA, and the layer thickness is 0.15mm. Some deburring and fitting may be required. Packaging will be "bubble wrap + envelope." Thank you.