PVC floating water bicycle tube 
Floating boat tube  uses compressed-air as medium to absorb the energy from impact. The sides of boats are softer when berthing, so collision is avoided. Compared with traditional bumper-style rubber fender, it has the following features, absorbing greater impact, less reverse impact to the boats, easy installation, more elasticity, not being bent out of shape under pressure, less weigh and practical and economical, easy to carry ,