Millamore Cardboard tunnels for small animals and pets encourage chewing and gnawing, help animals satisfy their natural instincts and exercise their teeth and gums. Tunnels also provide exercise and hideaway for your pet. These are easy to handle, are thicker and will last longer than toilet roll tubes. Made of recycled cardboard with no added chemicals, making these totally safe to chew. Tunnels come in 3 sizes- Small, Medium and Large.