Product Description Seamless construction Natural rubber tubes with heavy-duty valves Tubes are individually packaged with the part number and size on each box BikeMaster 500/510-16 Standard TR-6 Straight Metal Stem Tube at J&P Cycles Browse all J&P Cycles deals $19.99 In Stock at J&P Cycles Price verified 1d ago Buy Now at J&P Cycles Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand BikeMaster Size OS Condition New MPN V#370168 BikeMaster