Drag Specialties Tubes are made of high-quality, heavy-duty rubber, and come in a wide variety of sizes for diverse wheel applications. High-quality, heavy-duty rubber inner tubes. Custom sizes for extra-wide wheel applications. Sold individually. Tube Specifications: Tube size: 5.00-5.10 x 16". Valve type: SMV (side metal valve - threaded and nuts). Weight: 1 pound.