ITEM NAME:10 Pack - MR105-ZZ (5 x 10 x 4 mm) Ball Bearing F9U5 10 Pack - MR105-ZZ (5 x 10 x 4 mm) Ball Bearing F9U5 Inside Diameter: 5 mm Outside Diamater: 10 mm Width: 4 mm Color:Silver Bearing Material: Bearing Steel Ball Material: Bearing Steel Package includes: 1 X Ball Bearing 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..Bearing Material: Bearing Steel. Ball Material: Bearing Steel. Outside Diamater: 10 mm.