FTD II is 40% wider to maximize rim protection and dampen out suspension harshness on rough terrain, 30% taller to maximize tire sidewall support and allow lower tire pressure for increased traction, light weight to minimize rolling resistance and un-sprung weight, excellent high quality foam rubber based material (no pool noodle here). All this at a very affordable price! 29" single insertFits Inner Rim width 28mm to 40mm, Recommended Tire Width 2.30/2.80The system is designed to be used with tubeless-ready or tubeless converted rims and tires, and is compatible with tubeless tire sealantsSuper glue is provided to assist in adhering the two ends together.Kit Contains Foam Insert & Valve Stem29" Weight 230-250 grams (each) Flat Tire Defender FTD II - Single Tubeless System Enhancements