Refined the design and function after the inspection of 100 engineers and 2,000 fitness experts. Perfectly bring you a feeling of a real-life outdoor rowing experience. (Get help with order:1. 【Heavy duty rowing machine】Elected high strength steel and aluminum construction and Combined with the ergonomically designed deep contoured seat with Ultra smooth industrial grade roller bearings, Make sure the rowing machine is lightweight, with smooth and quiet motion while rowing. ).