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1.round manhole cover feature: 1)Environmental protection: non-toxicity raw material 2) Longevity: anti-corrosion, anti-rust, anti-abrasion, excellent anti-pressure capability; 3) Light weight:1/3 lighte than cast iron ones4)Various color and pattern available on request5)Anti-theft:Non-recycle,anti-theft naturally 6).No noise arised from automobile roller compaction2. Applications: (1) Electric power pipeline well; post, telecommunication, communication pipeline well; (2) Street lamp well, fire control well, all kinds of valve wells; (3) City water, drainage pipeline well; heat supplied, gas well; (4) As cover board for anti-corrosion project, open ditch; it as well as can be made according to customers requirements.