[8pcs Black Ball 608]

Bearings
Dimensions: 8 x 22 x 7mm (Inner Diameter: 8mm, Outer Diameter: 22mm, Width:7mm)
Material of Inner and Outer Ring: Chrome steelGcr15
Material of the Balls: Silicon Nitride(Si3N4) black Ceramic balls
Material of the Retainer: Nylon cage
Material& Color of Seal white POM seals
Numbers of Balls 7 Balls
Seal Type: Double side non-contact seals for less friction
Impact Load: 185kg~240kg
Features: Super fast speed,anti-dust,anti-rust, stable and quiet,excellent for skating player or industry usage.
Package Includes: 8 pcs bearings+ 1 small colorful box.
Pls note:The Color of box is at random.