Small animals will love using Living World TreeHouse Real Wood Logs as building material. They will also enjoy gnawing and carving the flexible wooden sticks just the way they like them. Made of all natural wood and assembled using non-toxic glue and dowels-not nails, the Logs are completely safe to chew and help keep teeth healthy. The logs can also be shaped into a fun playground for your pet to hide in. Size : Medium, suitable for rats, chinchillas and guinea pigs.