Specialized's Airlock Sealant is the in-tube solution for flat prevention, surpassing the competition in flat protection performance. It's featured here in a personal, 8oz container that's ideal for two standard wheels. - Non-toxic, non-separating formula doesn't have a limited shelf life like the competition. - Coats the tube for permanent protection. - Works with any bicycle tube with a removable valve core. - Works continuously to prevent slow leaks. - Completely homogenous, so it doesn't puddle. - 8oz bottle fills two inner tubes. - 8oz bottle includes valve puller and hose under cap.