These are replacement screw hole bosses for the 1/12 scale Tamiya radio-controlled models 'Porsche 959 Paris-Dakar Rally' and 'Celica Gr.B Rally Special'. They are designed to be fitted into broken bosses to restore the screw threads. Please use instant adhesive. These parts are created using a layered 3D printer. The material is PLA+, and the layer thickness is 0.2mm. Some trimming and fitting may be required to remove any burrs. Packaging will be "bubble wrap + envelope". Thank you.