HIGH-PRECISION, HIGH-SPEED BEARINGS - Used with skateboards, longboards, inline skates, roller skates, electric skateboards and provide the highest precision on the market. Accuracy better than REDZ. PRE-LUBRICATED WITH HIGH-SPEED RACING 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, stones, dust to extend bearing life and maintain precision. SUPERIOR QUALITY AT LOW PRICES: Bearings are built for racing and durability at a fraction of the cost. Hand-inspected before packing to ensure the highest quality for customers. HASSLE-FREE MONEY-BACK GUARANTEE: Designed to outlast all other bearings on the market. If for any reason you are not 100% satisfied, please return your bearings for a full refund, no questions asked. Features: 1, Closed with metal shields to protect the bearing from dust or possible contamination. 2, Widely used in: roller skates, skateboards, crooked cars, running shoes, inline wheels, double row wheels, ATVs, SUVs and other extreme sports equipment. 3, Suitable for skateboards, inline skates, roller skates, scooters and other skating applications, also available for 3D printer wheel bearings, CNC, etc. 4, Also used in industrial engineering, such as machinery, power transmission, instrumentation, home appliances, internal combustion engines, transport vehicles, agricultural machinery, construction machinery. Characteristics: Inner diameter: 8 mm; Outer diameter: 22 mm; Thickness: 7 mm. Package contents: 20 x 608ZZ Deep groove ball bearings