Grade 3 Si3N4 ceramic balls are used. BB90 ceramic BB kit. The highest rank in the practical range is grade 3. Silicon nitride (Si3N4) is a representative non-oxide ceramic, and has high strength and bending strength in high temperature environments. It is also stronger than other ceramics. Moreover, it is resistant to thermal expansion and has excellent dimensional stability. When ordering, please check your bearing size (inner diameter, outer diameter). Model number 6802: Outer diameter 24mm Inner diameter 15mm Thickness 5mm *The color of the product may look different from the actual product depending on the type of display etc. The specifications and design of the logo etc. of the posted product are subject to change due to improvements. We cannot answer questions about dimensions or personal fit that have not been announced by the manufacturer. Thank you for your understanding.


Product weight: 20 g
Packing size: ‎10.5 x 5.8 x 0.8 cm; 20 g
Material: ‎Ceramic
Thickness: ‎15 mm
Battery usage: ‎No