Step Aerobics is a great, simple way to boost your metabolism, work your cardiovascular system, and lose weight...in your own home! Small enough to store away easily. Slip proof surface, durable mat on top, non marking rubber floor pads Platform and blocks are made of high density polyethylene Versatile, strong and professional Teal and black 14 x 40 inch step surface Fully adjusts from 4' to 6' to 8' in height to accommodate users of all fitness levels Withstands up to 500 lbs.