Pacific Play Tents Institutional Tunnels of Fun Junction Set #20460 Blue Four 4 ft. x 19 inch tunnels and center junction - Tunnels collapse flat for easy storage and portability Polyester Dacron 600X300 weave fabric with extra heavy duty construction for heavy usage in schools, churches, camps, clubs and other group activities Interior padding around hardened heavy duty spring steel wire structure for safety and playtime comfort Easily wipes clean with a damp cloth and mild soap - indoor or outdoor use Crawling and tunnel play are excellent for muscle and motor skill development in toddlers and children