HIGH SPEED PRECISION BEARINGS - Used with skateboards, longboards, inline skates, inline skates, electric skateboards and provides the highest precision on the market. Precision superior to REDZ. PRé-LUBRICATED WITH RACING HIGH SPEED LUBRICANT: Ultra-fast lubricant for guaranteed high speeds and minimal friction. The yellow shield seals the lubricant inside the bearing and wheel. QUALITY AND DURABILITY - Made of high quality lubricated ABEC-7 608ZZ steel. Protection against dirt, rocks, dust to extend bearing life and maintain accuracy. PREMIUM QUALITY AT FINE LOW PRICES: Bearings are built for racing and durability at a fraction Cost. Hand inspected before packaging to ensure the highest quality for customers. Features: 1, closed with metal shields to protect the bearing from dust or any possible contamination. 2, widely used in: roller skates, skateboard, twisted cars, racing shoes, inline wheels, double row wheels, ATVs, SUVs and other extreme sports equipment. 3, suitable for skateboards, roller skates inline, roller skates, scooters and other skating applications, also available for 3D printer wheel bearings, CNCs, etc. 4, also used in industrial engineering, such as machinery, power transmission, instrumentation, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery. Features: Inner diameter: 8 mm; Outer diameter: 22 mm; Thickness: 7 mm. Contents of enclosure: 20 x 608ZZ Deep Groove Ball Bearing