Natural apple wood: The playgrounds are made of apple wood. Chewing is natural and safe, satisfying his instinctual need to keep his front teeth straight and healthy, and allowing himself to nibble while bored in the cage for a little fun. This gives your pet more room in the cage and pets can use these platforms to get on and off and help them move around. Helps exercise small animal limb strength, promotes movement in pets, and helps develop coordination and balance. A great opportunity to let your little rodents play and exercise. EASY INSTALLATION: Washers and nuts help you easily assemble and easily adjust the height. Application: Pet ladders are suitable for small rodents such as mice, Syrian hamsters, dwarf hamsters, gerbils, etc. If you have any questions, please contact us and we will help you solve the problem.