Durability: Made of Premium high-density plastic, strong, corrosive resistance and durable to use. One-Way Valve: This valve is a one-way inflation valve, suitable for rapid inflation. Bonnet Design: The compact design with a bonnet ensures leak prevention. Applicability: Appears in pairs and is a good replacement for your inflatable boat. Suitable for most inflatable boats, rafts, rubber boats, etc. size:2.2x1.7cm Material:plastic colour:black Package Contents: 4 x Boston Valve Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.