Size:30mm diameter complete piece and roughly 4mm diameter within screw hole High Quality:Motor top base gearis made of High quality plastic,blade base gear is product of superb rubber,These elements are compatible with MB1001 250W safety and durability. color:Black + transparent Material:Plastic + Rubber Package Contents: 4 x rubber gears for only the blade 2 x plastic gears for the Motor base Only the above equipment content, different merchandise aren't included. Note: Light and diverse displays can cause the color of the thing in the picture somewhat varied from the genuine thing. The measurement allowed error is +/- 1-3cm.