VXBTM Brand, Full Ceramic 608 Skate Bearing, 8x22x7 Miniature Bearing, 608 Full Ceramic Ball Bearing, the inner diameter is 8mm, outer diameter is 22mm and the width is 7mm, this is a popular size that could be used in many applications, Bearing is made of Ceramic. Item: 608 Ball Bearing Type: Full Ceramic Ball Bearing Cage: PTFE Balls: ZrO2 Ceramic Inner/outer races: ZrO2 Ceramic Size: 8mm x 22mm x 7mm/metric Inner Diameter: 8mm Outer Diameter: 22mm Width: 7mm Quantity: One Bearing VXB Category: Full ceramic bearings608 Full Ceramic Bearing 8x22x7mm Miniature608ZR02-ZR02-PTFE.