For protection from punctures on daring downhills and dirt jumps, outfit your bike with the Slime(R) Smart Tube Self-Healing Presta Valve 26" Bike Tube. Its innovative Slime(R) sealant prevents flats by instantly and repeatedly sealing punctures up to 1/8". This unique tube is made with durable Butyl rubber while the sealant offers puncture protection for two years. Inflate the tube with its Presta Valve and hit the trails without worry. Features: Mountain bike tube Strong and durable enough for rough trails Perfect for replacing a worn out tube and preventing flats Features Slime(R) sealant Self-healing design instantly and repeatedly seals punctures up to ?" Provides protection against flats for up to 2 years Material: Butyl rubber Size: 26" Valve type: Presta Valve length: 48mm Valve threaded: Fully threaded with locking nut and removeable presta core Weight: 222g