Tumbl Trak Folding Gymnastics Mat, 4ft x 8ft Tumbl Trak Black Martial Arts Tumbling Mats have four sided hook and loop to enable connection on all sides  The Martial Arts mat has 2 ft wide black folding panels for easy handling and storage  They are made with 18 oz. vinyl and industry standard, cross-linked polyethylene foam  They do not contain lead and have passed testing requirements enacted by the Consumer Protection Safety Improvement Act of 2008