This 4-Section Extension Panels for the Climb-N-Crawl Caterpill is great! For use with either 3-section or 4-section "gus". These sections extend the length of the crawl-through tunnel. Measures over 5.5' long from tongue to tail with 20 1/2" opening at either end. Feet hold unit in place. Climb on, in, & around.…70in.L x 42.5in.W x 39.4in.H