ITEM NAME:Steel ball bearing with diameter of 9 mm for bicycle wheel (40 pieces), spa X4P2 Steel ball bearing with diameter of 9 mm for bicycle wheel (40 pieces), spa X4P2 Product name: Steel Balls Bearing Diameter: 9 mm. Color: Silver. Material: Stainless steel Weight: 121 g. 100% brand new and high quality. Package: 40 x steel ball bearing Only 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..Material: Stainless steel.