"I bought these toobs to add on to my SAM Palace. They are super easy to build with, come in lots of fun colors, and are perfect for Dwarfs, and Shorthairs. My two Winter White males LOVE them! They hardly spend anytime in thier main part of thier cage. They only go there to eat and drink now! The only thing about these toobs is the fact that Teddy Bear hamsters will NOT be able to fit. Otherwise thier great! Your hamsters will love them. These are a must have for any SAM or Penn-Plax home!"