Take on the town without worrying about flats from potholes and curbs when you outfit your bike with the Slime Smart Tube Self-Healing Presta Valve 700c Bike Tube. Featuring Slime sealant, this tube prevents flat tires by instantly and repeatedly sealing punctures up to 1/8 . The tube is made with durable Butyl rubber and the sealant offers protection for two years. Inflate the tube with its Presta Valve and enjoy a worry-free commute. Features: Road or hybrid bike tube Designed for riding on pavement or paths Perfect for replacing an old tube and preventing flat tires Self-healing design instantly and repeatedly seals punctures up to ?" Provides protection against flats for up to 2 years Material: Butyl rubber Size: 700 x 28-35mm Valve type: Presta Valve length: 48mm Valve threaded: Fully threaded with locking nut and removable Presta core Weight: 199g.