【26x4.0-4.5】 26 inch bicycle inner tubes with 32mm Schrader valves, tire width ranging from 4.0 inches to 4.5 inches. Attention: Please check your tire size before purchasing 【Enhanced Puncture Protection for Safe Riding】：The bike tube features built-in puncture-resistant technology, providing added protection against sharp objects like glass, nails, and debris. This helps prevent flats and ensures safer rides 【Premium Butyl Rubber for Durability】：Made from high-quality butyl rubber, this bike tube offers excellent air retention and resistance to wear and aging. It provides long-lasting performance, reducing the need for frequent inflation and making it perfect for daily use 【Quick installation and maintenance】: Besides the two inner tubes, we also offer tire pry bars and emergency tire patches. The tire pry bars can assist you in installing the inner tubes quickly, and the emergency tire patches can enable you to get back on the road swiftly in emergency situations 【365 days after-sales service】: In case you run into any issues with our product, just snap some pictures and reach out to us. We'll respond promptly to make sure your valuable time isn't wasted 26 inch fat tube