Slime, 20" x 1.75"-2.125" Schrader, Heavy Duty Super Thick Self Sealing Bicycle Tubes, Gain Extra Protection Against Punctures & Ride Protected For Up To 2 Years, Seals Multiple Punctures, Seals Tread Area Punctures Up To 1/8" 3 mm In Size, Non-Toxic & Non-Flammable, Cleans Up With Water.