This listing is for a set of Pure Cycles Tube Pure 700x18-25 27x1 Presta Valve Tubes, with a weight of 0.2500 lbs. The tubes are suitable for use with bicycle tires and are made by the brand Pure Cycles. They come with a California Prop 65 Warning, as indicated in the title. The item is categorized under Tubes, Bicycle Tires, Tubes & Wheels, Cycling, and Sporting Goods. If you have any questions or concerns about the product, please feel free to contact us. Thank you for considering this listing.