Good luck breeding them! Be careful if your not used to holding them.. I hold them by their scruff like this:
http://s23.photobucket.com/albums/b3...DSC04909-1.jpg
They are capable of jumping like.. 2-3 ft into the air if you try to just pick them up. Picking them up by their tail can really hurt them and upset them, as well as running the risk of de-skinning the tail. (happened to me before previously with normal mice)
You don't have to worry about them biting though, unless you get an angry momma.
They won't fight with each other either, they're very social.