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I think the rosewood pico cage is way too tall for a dwarf ham as they are very prone to falling, height doesn't really offer what hamsters need tbh, they need a larger floor space & a base with enough depth for deep substrate or as deep as you can get in a barred cage. The cage does need to be tall enough for a large enough wheel plus substrate though.
Can you get the Hamster Heaven cage? Used without the tubes & penthouse it can make a good sized set up suitable for most dwarf hams.