Metal Dual V WheelMaterial: High quality 304 stainless steelCondition: New100%Type: V PulleyModel: V-type PulleyBore: 5mmOutside diameter: 16mmThickness: 5mmBearing: 625ZZ PS:1.BIQU Store ‘s pulley is same as our darwing, Pls see our darwing as below. 2.Bearings: 625ZZ