Made by high quality PVC. sturdy, anti-corrosion and durable. Easy to inflate and to deflate. It will fit most inflatable boats, river rafts and kayaks. Comes in three parts. One inside part , one outside part and valve cap Double seal leak protection Easy to install and disassemble. It is a great accessory for boating enthusiasts. Specifications: Material: PVCColor: Gray Upper Outer Diameter: Approx. 6.2cm/2.4'' Lower Outer Diameter: Approx. 4.2cm/1.6'' Height: Approx. 5cm/2" Weight: Approx. 85g Package Includes: 1 x Boat Air Valve