Size:30mm diameter whole piece and roughly 4mm diameter inside screw gap High Quality:Motor top base gearis manufactured from High quality plastic,blade base gear is product of quality rubber,These ingredients have compatibility with MB1001 250W security and durability. color:Black + clear 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, diverse merchandise shouldn't included. Note: Light and various reveals could cause the color of the thing within the picture slightly various from the genuine thing. The measurement allowed error is +/- 1-3cm.