They are beautiful colours! I agree with cypher on the exercise balls, there are lots of different opinions on whether exercise balls are okay or shouldn't be used at all and it comes down to personal preference and the hamster itself! When you try them out you could always get them used to them before hand, Dandi doesn't use her ball but I use it to move her around. She happily hops in so it could be a good way to get your hams used to going in and getting comfortable in them before closing them in.
This page could help identify their exact colours if you wanted to find out!
Russian Dwarf Hamster/Campbell Hamster Colors - The Different Species - Hamster Hideout Forum
Have they got names?
