Featuring a Slime sealant inside, the Slime Self-Healing Presta Valve 27.5'' Bike Tube stops flats so you can keep on riding. FEATURES: Prevents flats up to 2 years Instantly seals punctured area up to 1/8? in size Can seal repeated punctures Features Slime sealant Designed for 27.5"/2.0-2.4 tires Non-toxic and non-flammable Cleans up with water