- Made of durable material designed for good grip and speed under various conditions, offering long-lasting durability. - Equipped with ABEC 9 bearings and gaskets. Bearing inner diameter is 8 mm, outer diameter is 22 mm. - 78A hardness provides excellent grip, speed, and durability. These high-performance inline skate wheels deliver smooth rolling with reliable floor grip. Suitable for skating styles: jam, speed, racing. - The wheel hub features oversized inner and outer edges, reducing polyurethane content for lighter weight and improved responsiveness. The center design allows for additional polyurethane placement, enhancing grip, control, and overall ride quality. Color: Black + Red Material: PU Size: 58 x 39 mm Package Contents: 8 x Roller Skate Wheels (bearings included) 1 x Mounting Wrench Note: Light and display settings may cause slight color variation between the image and actual item. Measurement error allowed within +/- 1-3 cm.