BikeMaster Tube - Offset Rubber Stem (5.00/5.10-16) BikeMaster Tubes are made from high-quality butyl rubber, utilize heavy-duty valves, and are manufactured using a very durable seamless construction. It&#39;s the perfect choice to get your bike rolling smooth again!Seamless construction.Best inner tube value available.Butyl rubber inner tube with heavy-duty valve.Tube Specifications:Tube size: 5.00/5.10-16.Valve type: TR-15 offset (straight rubber ste