1. with good resilience and hardness, the buoy hull could absorb the collision energy and return to the original shape when impacted
2.with light weight, the buoy has small inertia, and it could shift quickly to dissolve the collision strength to avoid the damaging.
3.with good toughness, the buoy is stretch resistant, and hard to be tear, which could maximum absorb the collision energy.
4.there are strong steel skeleton supported, and high density waterproof polyurethane foam is filled inside the float, which will help the buoy to bounce back without distortion when impacted. 5. the safety guard ring for lantern is made by UHMWPE sheet, and supported by the steel frames, could absorb the collision energy and improve the protection to lantern and solar panels.
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