4mm Loose Ceramic Balls ZrO2 Bearing Balls

4mm Loose Ceramic Balls ZrO2 (zirconium Oxide), this is a popular size that could be used in many Bicycle, Balls are made of Ceramic ZrO2.

• Item: Ceramic Loose Ball
• Size: 4mm = 0.157" inch
• Material: Zirconia Ceramic (ZrO2) (Zirconium dioxide)
• Quantity: One Ball