Slime Self-Healing 16 x 1.75-2.125 Bicycle Tube 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: 16" x 1.75-2.125" Designed to seal tread area punctures up to 1/8 (3mm) in size