Slime 30044 Self-Sealing Smart Bike Tube, Schrader Valve (26 x 1-3/8 inches) Pre-installed with Slime Sealant to provide maximum puncture protection and prevent flat tires on your bike Instantly and repeatedly seals tire punctures for up to 2 years Valve type: Schrader Fits tires: 26" x 1-3/8" Designed to seal tread area punctures up to 1/8 (3mm) in size