Slime 30058SL Bike Inner Tube with Puncture Sealant, Self Sealing, Prevent and Repair, Schrader Valve, 20" x 1.5 2.125"

These are no ordinary bicycle tubes! These extra strong inner tubes stop flats for 2 years because there is Slime inside Slime Tube Sealant seeks out and instantly seals punctures in your tubes up to 1/8" (3mm) using Fibro-Seal Technology Designed specifically to stop tube punctures from ruining your ride and keep you going Schrader Valve tube, that installs like any traditonal inner tube and full instructions inside every pack Environmentally friendly; non-toxic, non-corrosive and non-hazardous, Non-flammable, water soluble