CushCore is an engineered foam insert to be mounted inside a tire, designed to absorb impacts, reduce vibration and increase lateral stability. These characteristics translate to a more controlled, comfortable, and faster ride.Mixed set contains one 29 and 27.5" insertFits tire widths 2.1 - 2.6" and rims with internal width 22 - 35mmThe system is designed to be used with tubeless-ready or tubeless converted rims and tires, and is compatible with tubeless tire sealantsA specially designed tubeless air valve is included with each insert; allowing air to move through the valve without becoming obstructed by the insertThe insert divides the inner volume of the tire in half, maintaining air underneath the tread and the foam insert next to the rimIncludes (2) 44mm CushCore presta air valves, valve core tool, installation instructions, and rim stickers CushCore Foam Tire Inserts - Pair Tubeless System Enhancements UPC: 701822997775