The Spitfire Hardcore 2 Conicle Wheels are a new high performance full core wheel technology with 101 inner duro and 99 outer durp. Full core, 200% urethane that's speed guaranteed. Made with Full Core technology. Full Core Hardcore wheels tak full advantage of an exclusive new molding process developed to create the best urethane core wheels made. Full Core 101 duro inner cores produce a super fast, responsive ride without sacraficing the rebound or traction a 99 outer duro riding surface provides. No other regular core wheel comes close. Ride the fire. Spitfire graphics at one side.Sizes available as seen below. Wheels sold in set of four.