8x35x12mm Polyurethane Rubber roller wheel Bearing Sealed Miniature - TirePolyurethane Rubber Sealed Wheel Bearing with Tire 8mm x 35mm x 12mm PU Covered Deep Groove Ball Bearing This PU covered wheel bearing combines the toughness of GCr15 bearing steel with the flexibility and durability of polyurethane. Designed for applications needing both smooth rolling and shock absorption, it features rubber seals on both sides to keep out dust. Perfect for small carts, sliding systems, or any rolling unit that takes a beating.