Product parameters Material: plastic Packing: OPP bag Specification: small: 12*12*6.5 CM medium 15.5*15.5*8CM large 18.5*18.5*8 CM Weight: small 115 grams medium 150 grams large 210 grams Adjustable Height and Solid Base - Adjustable height design makes it possible that every small animal can start their happy running easily.This silent hamster wheel also comes with cage attachment,which frees up floor space in case no much floor room left Ideal hamster accessories - This candy hamster wheel with stand and cage attachment recreated the color of the candy 1:1,which is adorable.Super cute windmill outlook makes your loved pet feel like they're in the fairy tale world Technology integration - As the essential one of hamster toys,this dwarf and syrian hamster wheel got a high-tech rational design Super silent design - Selected premium bearing from Japan ensures the quiet night even if the hamster wheel small or large is spinning in high speed，so wobble will never happen! What’s more,the raised grooves ensure friction when pets running so that they have no difficulty getting the wheel to spin Comfort Hamster Wheel - 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