The Bont Red Magic's focus is to maintain high levels of grip and increase the roll, providing the fastest inline skating racing wheel. Bont Red Magic Inline Speed Wheels The Bont Red Magic Inline Wheel is the most popular inline speed skating race wheel on the market as a result of collaboration with MPC wheels. The Red Magic wheels come in Sizes: 90 mm, 100 mm, and 110 mm Hardness: Firm, XFirm, and XXFirm Bearings not included Sold in unit Features Features Bont Red Magic Inline Speed Wheels Made in: USA Application: Road or track Diameter: 90mm, 100mm, 110mm Hardness: Firm, X-Firm, XX-Firm Bearing size: 608 The Bont Red Magic inline skating wheel is available in 90 mm, 100 mm, or 110 mm diameters. The unique fan hub design cools the urethane at high speeds. This is the fastest plastic hub wheel that money can buy. Technical Specifications Technical Specification Roll Firm: when race conditions are rough or slick Roll X-Firm: when race conditions are hard, smooth, and dry Roll XX-Firm is suitable for very smooth tracks and long-distance skaters.