SHREDPROOF inner tubes use a high-butyl rubber for the absolute most durable, puncture resistant, stretchy and comfortable rubber tube on the market. We seal all the air in with our anti-leak valves and package them in individual recyclable boxes to prevent damage in shipping. SHREDPROOF inner tubes are 100% recyclable and patchable. When you absolutely need the best quality and price for performance, SHREDPROOF leads the way! We have 20 years experience in the USA repairing and designing bicycles and bicycle parts, and we have repaired thousands of flat tires. This experience helps guide us on the best design and material selection for our inner tubes to help protect you and your family from future flats. All SHREDPROOF inner tubes with schrader valves come with glow-in-the-dark valve caps.