Bio-Tunnels for Mice & Rats are now 10% off! K3556 & K3557 Bio-Tunnels for Rats, Cardboard 50/Box- On Sale for $18.00 Bio-Tunnels for Mice, Cardboard 100/Box- On Sale for $27.00 Made of 100% recycled pulp paper Very economical sheltering, nesting and gnawing enrichment Helps reduce boredom and aggressive...