Bones Skateboard Wheels STF Haslam Blue Lagoon - 54MM by Powell are specifically engineered from top quality components to obtain all the best properties necessary for the ultimate in street wheel performance. Features - Diameter: 54mm - Hardness: 83B - Formula: STF - Color: Black - Core: No - Surface: Smooth - Sugg. Use: Street - - Bearings and spacers not included. - Sold in sets of 4