The Xiser Home Model has five year consumer warranty. It has cast aluminum hydraulic cylinder system. Its adjustable resistance responds to your effort and ability very easily. It has silicone fluid for smooth & quiet operation and portable design. It uses only 2 cubic feet of space and folds to 20.5" x 13" x 4".The Professional/Commercial Model of the Xiser has the same step height as the home model but features larger cylinders for extended commercial or gym use. It has one year institutional warranty. The cast aluminum alloy weighs only 14 lbs and can withstand weight in excess of 400 lbs. Its patented hydraulic cylinder system and adjustable resistance responds easilty to your effort and ability. It has silicone fluid for smooth & quiet operation and portable design. It uses only 2 cubic feet of space folds to 20.5" x 13" x 4".You get the best quality materials and the most precise machining possible. No other exercise machine or training machine can match the quality ofXiser, as testified through 20 years of exports to the highly demanding world market of Japan. The brute toughness of the Xiser beats NFL or NCAA football players while no ballerina is left wanting for a more precise training instrument. Nothing comes closer to perfection. Your eyes will feast at the sleek aircraft alloy pedals and frame and the elegant cooling fins of the anodized interactive precision cylinders. You will be a proud owner of the magnificent wellness machine.