10-Pack Loose Ceramic Si3N4 Balls 16.669mm = 21/32" G20 Bearing Balls

21/32" Loose Ceramic Balls Si3N4 (Silicon Nitride), this is a popular size that could be used in many Bicycle, Balls are made from high-strength Ceramic Si3N4.

• Loose Balls
• Size: 16.669mm = 21/32" inch
• Material: Si3N4 (Silicon Nitride)
• Quantity: Pack of 10 Balls