Presta Valves: Available With 48mm Presta Valve, Non-Removeable Core. Butyl Rubber Construction: Ensures Excellent Air Retention and Durability. Puncture Resistant: Thick Wall Construction Provides Protection Against Sharp Objects. Patchable: Compatible With Butyl Tube Patch Kits. Extended Tube Life: Butyl Chemistry Engineered for Longer Life. Flexible Fit: Adapts Well Under High Pressure and Heavy Loads. Eco-Friendly Packaging: 100% recyclable packaging, so you can hit the trails with confidence, knowing you're minimizing your environmental footprint.