Justa Tube is not really just a tube! Sure it's a black donut, but it's a hypoallergenic black donut, much less likely to cause an allergic reaction then that old truck tube you used to use! The Schrader valve stem is shorter than a standard auto valve and has a tapered cap, so there's no discomfort or scratching legs. It's made of isobutylene isoprene synthetic rubber, an upgrade from standard tire tube. It's more resistant to heat, abrasion, ozone and sunlight. Justa Tube provides year round fun and is easy to store! It's a durable snow tube in winter. In summer, you'll enjoy it as a durable river, lake or ocean float. Justa Tube comes in two diameters of 32" or 40" (81.3 cm or 101.6 cm) deflated. Sport Stuff Justa Tube Justa Tube is Not Really Just-a-Tube! Sure it's a Black Donut, a Hypoallergenic Black Donut Much Less Likely to Cause Allergic Reaction then Old Truck Tube Unique Short Stem Schrader Valve Valve: Tapered Cap, No Discomfort or Scratching Legs Made of Isobutylene Isoprene Synthetic Rubber Upgrade from Standard Tire Tube More Resistant to Heat, Abrasion, Ozone and Sunlight Year Round Fun and Easy to Store! Durable Snow Tube in Winter Durable River, Lake or Ocean Float in Summer Available in 2-Diameters: 32" or 40" (81.3 cm or 101.6 cm), Deflated Item Dimensions: 9 L x 5 W x 13.5 H Unit of Measure: EA This product ships in approximately 1 days