Use Fun-nels 10" Tube to expand any CritterTrail habitat or accessory and watch your pet explore. Bubble Wave tube design features a comfort grip that is safe for your pet's paws. Connector Rings snap on easily to ensure a safe and secure passageway. Easy to clean, tubes pull apart and snap back together for trouble-free cleaning. Universally connectable, easily attaches to all CritterTrail, Habitrail and S.A.M. systems. Tube is 10" long and includes a Connector Rings. Assorted colors. SUPER PROTECT Antimicrobial Technology is built into all plastic interior surfaces providing a healthier, cleaner habitat for your pet.