R188 Full Ceramic Ball Bearing, the inner diameter is 1/4", outer diameter is 1/2" and the width is 1/8", Balls are Zro2 Ceramic, Cage is PTFE, Bearing is made of Ceramic.

• Item: R188 Ball Bearing
• Type: Full Ceramic Ball Bearing
• Inner/outer races: ZrO2 Ceramic
• Balls: ZrO2 Ceramic
• Cage: PTFE
• Size: 1/4" x 1/2" x 1/8" Inch
• Inner Diameter: 1/4" Inch
• Outer Diameter: 1/2" Inch
• Width: 1/8" Inch
• Quantity: Ball Bearing