Slime tubes.Factory-filled with a precise volume of Slime Tube SealantSeals punctures up to 1/8" (3mm)Environmentally safe, non-toxic, non-hazardous and water solubleItem SpecificationsValveSchraderISO Diameter590 / 26 x 1 3/8",597 / Schwinn S-6ISO Width37mmLabeled Size26 x 1 3/8"Valve LengthSchraderTube CompoundButylValve CoreRemovableValve ShaftSchrader