About this product range:~ Get Ready, Get Set... Go! Wheel-N-Around Provides Free Wheelin Fun For Hamsters & Gerbils In The Fast Lane! This Totally Interactive Exercise Wheel Provides Runaway Racetime Fun In Four Ways: Let It Roll On The Floor, Let Pets Race Around The Super Pet Hamtrac, Set On The Included St&, Or Attach To Any Wire Cage. Wheel-N-Around Is Available In Four Great Colors Including: Racing Red, Blazin Blue, Go-Go-Go Green, & Lighting Yellow.