Prevue Pet Products' Hamster Haven is a multilevel hamster cage that comes in three sizes: small (14 in. x 101/2 in. x 16 in.), medium (173/4 in. x 113/4 in. x 173/4 in.) and large (215/8 in. x 133/8 in. x 143/4 in.), the manufacturer reports. Each cage features a large, top-opening door and a small front door, and accessories include platforms, ramps, exercise wheels and a hideaway dome in varying quantities based on cage size, the company adds.