Reasonable Size of Running Drum & Wide Running track brings a relax back feeling, as they do not need to bend their back when running, let them enjoy their endless running time, help them to build own muscle, keep them happy & mental well-being.
- 8.2 inch Running Drum: recommended for most Dwarf Hamsters, such as Golden Bear, Roborovski hamsters, Campbell hamsters, Chinese hamsters, Dwarf Winter White Russian hamsters, Lemmings, mice, or tiny Gerbils.
- 6.7 inch Running Drum: recommended for most Dwarf Hamsters, such as small-sized Roborovski hamsters, Campbell hamsters, Chinese hamsters, Lemmings, mice, or tiny Gerbils.