The Revision Clinger Outdoor Hockey Wheel features a good exterior urethane that will last long outdoors while providing excellent grip on asphalt or concrete. The urethane is hardened on the outside so it won't wear down quickly but still bends when you turn for increased surface area, resulting in better grip. These wheels were designed and poured by Revision in the USA so you know you're getting quality at a great price. Single Pour with a tapered wheel profile Made with the finest materials in the USA Wheel Hardness Body Weight Level of Play Surface 82A Up to 230 lbs Performance Outdoor