I found a newspaper from 1998 in the box, so I think it's from that time. The cage in the photo can be stacked four tiers high. It has casters. It's about 40 x 33 x 22 (cm). It appears to be unused. The sides are transparent if you peel off the paper. It's a temporary assembly, so there are gaps, but there won't be any gaps if assembled properly. Each tier can be used independently. Cat tower Rabbit Dog Cat Hamster Pet Dog tower Cage Gauge Multiple pets