Climbing Background is 10" x 20" and is made from coconut fibers. It will provide an aesthetic background to a hermit crab’s environment. Small pieces of Velcro are provided so you can attach the background to the back of the enclosure. Hermit crabs like to climb, the Climbing Background allows hermit crabs to climb on it which is a natural behavior and will satisfy their need to climb. When the Climbing Background is sprayed with water (use Crab Island Mr. Mister) it will absorb moisture allowing the enclosure to stay humid.