This Premium Service inner tube is manufactured to the highest quality. This tube is for is used for sledding in the snow, riding down the river or just floating in a pool or lake. The tube has a NXV valve stem which keeps the user safe from a protruding style stem. Center hole is 20" in diameter. The size marked on the tube is 10.00R20, this may differ from the size needed as most inner tubes are made to stretch in order to fit multiple tire sizes. According the manufacturer this tube will fit on the following tire sizes: