EWONDERWORLD 90" X 43" X ~9/16" Black & Gray Non-Toxic Non-Recycled Quality & Extra Thick Treadmill Waterproof Mat w/Edging Equipment Floor Covering 11 interlocking waterproof foam mats in black and 10 in gray (covers 21 square feet). 12 sides and 8 corner edges in black and white for visibility. Each mat measures 12" x 12" (inches) and ~9/16" of an inch thick. This set is designed for ~3.5' x ~7.5' (feet) area which fits standard treadmills. Made from non-recycled, non-toxic, light weight, durable, and high density EVA foam. High quality: extremely durable and does not easily tear. Quiet, safe, soft, durable and easy to clean. Mats last up to 5 years under proper use.