FR156-2RS Full Ceramic Sealed Flanged Bearing 3/16x5/16x1/8 ZrO2 Part Number: Kit8453 Shipping Weight: 0.02 pounds Ball Bearings FR156-2RS Full Ceramic 3/16 x 5/16 x 1/8 Zirconia Full Ceramic Flanged Ball Bearings FR2-5-2RS, , Bearings are made of Ceramic. Item: Sealed All ceramic Flanged Ball bearings Type: Sealed Full Ceramic bearing Inner/outer races: ZrO2 Ceramic Balls: ZrO2 Ceramic (zirconia) Cage: PTFE Closures: PTFE Covers (white)