model: 604 ZZ
Colour: silver
Material: metal
Size: 4 x 12 x 4MM(Inner Diameter x Outer Diameter x Thickness)
Bearings reduce friction by providing smooth metal balls or rollers and a smooth inner and outer metal surface for the balls to roll against.These balls or rollers "bear" the load, allowing the device to spin smoothly.
Package Included: 20pcs x Bearings