Cush Core Trail Tire Insert Set. Features: Third party testing has revealed that, compared to a standard tubeless setup, Cush Core provides a 12% smoother ride, 35% more sidewall stability, 16% less suspension travel consumption, 3% less rolling resistance, and 50% less impact force transferred to the rim This system is designed to be used with tubeless ready or tubeless converted mountain bike rims and tires, as well as standard tubeless sealant Doesn't absorb sealant Includes special tubeless air valves that allow air to move through the valve without becoming obstructed by the insert Amazon.com sales are strictly prohibited by the Manufacturer Specs: Package:single with valve Wheel Size:27.5" Width Rim:tire 2.1-2.6"/rim 22-35mm Weight:190g