Enjoying Cat Tunnel Kitten Collapsible Train Toy Give your cat hours of entertainment and exercise with this fun This popular tube gives your kitty more ways to have fun. It provides hours of exercise & self-amusement. Sturdy - Tough interior metal spring and thick, double-ply outer walls with double-sewn seams can withstand vigorous play. Collapsible - Quickly sets up and flattens down, securing with a simple knot when playtime is over. Easy to take anywhere. Tunnel length: 47"/120cm, tunnel diameter: 9.8"/24cm, hole diameter: 4.7"/12cm.