Conquer the concrete. These roller hockey wheels are designed with tougher materials and feature a durometer rating of 82A - perfect for helping you easily glide across rougher surfaces like asphalt or concrete. PRODUCT FEATURES: Designed for use on flat hard terrain like asphalt Glide optimized wheels for rough surfaces Hard wheels, low grip ADDITIONAL DETAILS: 4-Pack Senior skates compatible with 80mm or 76mm sizes Junior skates compatible with 76mm, 72mm, or 68mm sizes Youth skates compatible with 68mm or 59mm sizes