This is a spaceship bed for a cat cage. I set it up for my beloved cat for Christmas, but she was scared of the transparent bed and would come right back out, so it's just been for decoration. Please use it for cats who are used to spaceship beds. I attached it to a common Iris Ohyama cage, so it doesn't seem to have any specific cage requirements. ◎ Ultimately, I didn't use it, but I did set it up, so there are a few minor scratches. I will disinfect it with ethanol before shipping. Width 45cm, Depth 45cm, Inner dimensions of the spaceship bed 30cm. Shipping costs are quite high, so I'm not able to offer a significant discount at this time.