608-Z Shielded Sealed Miniature Skateboard-Bearings - 8x22x7mm, 10 Pcs, Used in Longboard and Scooters Machinery, Roller Skates (10)This 608-Z is made of high quality carbon steel.   Features:   1.     This product is made of highquality carbon steel. High speed operation, low noise, high temperatureresistance and smooth rotation.   2. for small m..