Wonder Mat Non Toxic Extra Thick Waterproof Exercise Gym Mats (Set of 4), Gray, 2' x 2' 4 piece 2ft x 2ft GRAY interlocking exercise mats that create 16 square feet. Set up in seconds with easy do-it-yourself interlocking mats. 9/16 of an inch thick provides extra protection and impact absorption that exceeds the anti-fatigue protection requirement for high intensity training and workout. Made in Taiwan and from non-recycled, non-toxic, and high density EVA foam. They are lightweight, durable, and lead-free. Waterproof and easy to clean with damp cloth and mild soap. Lasts up to 10 years under proper care. Passed CPSC standards and 53 substances of very high concern including toxicity report. Full test reports will be provided upon request.