It made of metal material, function spiral teeth.Bevel gears are useful when the direction of rotation of a shaft has to be changed.Big replacement for used gear by LG grinder.It is a non- product.Specification:Product name: bevel gearSuitable for: LG grinderMaterial: metalChainring size: 44 x 15.5mm ( * max thickness)Suitable for shaft diameter: 10mm / 0.4 inchPinion size: 19 x 12mm / 0.7 x 0.5 inch ( * max thickness)Suitable for pinion shaft diameter: 8mm / 0.3 inchColor: silverWeight: 102g of delivery: 1 x curved toothed bevel gear setOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/-1-3cm.