30pcs 13size Miniature Metal Ball Bearing Size: Mr74-zz 4 X 7 X 2.5mm

model: MR74-ZZColour: silverMaterial: metalSize: 4 x 7 x 2.5mm(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: 30pcs x BearingsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.