Yokohama fender (for ship use) uses compressed-air as medium to absorb the energy from impact. The sides of ships are softer when berthing, so the result of collision-avoiding is achieved. Compared with traditional bumper-style rubber fender, it has the following features, absorbing greater impact, less reverse impact on the ships, easy installation, more elasticity, not being bent out of shape under pressure, less weigh and practical and economical. So pneumatic fender has widespread application on oil tankers, container vessels, luxury yachts, ocean platforms, larges shipyards, military ports and larger underwater foundations of bridges, etc.