The game includes 6 high-quality ball bearings made of laminated steel for greater strength, speed, and durability. Designed to last longer than any other bearing on the market. Compatible with skateboards, longboards, inline skates, roller skates, electric skateboards, and other vehicles. Dirt protection with stainless steel sealing material. They offer a smooth and quiet ride, with minimal rolling resistance, allowing you to slide faster and for longer.