General description High-speed, high-precision 608ZZ ball bearings designed for use in skateboards, longboards, inline skates, roller blades, electric skateboards, and various other applications. These bearings offer superior accuracy and are built for racing and durability at an affordable price. Technical specifications Inner Diameter: 8 mm Outer Diameter: 22 mm Thickness: 7 mm Material: High-quality lubricated ABEC-7 steel Quantity: 20 pieces Compatibility and accessories Suitable for skateboards, inline skates, roller skates, scooters, and other skating applications Also compatible with 3D printer wheel bearings, CNC machines, and various industrial applications Widely used in machinery, power transmission, instrumentation, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, and construction machinery Installation Enclosed with metal shields to protect the bearing from dust and contamination Pre-lubricated with high-speed racing