This is a great wheel roller for your pet hamster to do exercise or enjoy itself when you're out. Made of high quality material, it's sturdy and durable. All finishes are non-toxic, safe and Eco-friendly. Anti-slip design, safe for the hamster to run. Features: Made of high quality material, sturdy and durable. All finishes are non-toxic, safe and Eco-friendly. Anti-slip design, safe for the hamster to run. Easy to install and clean. Great wheel roller for you hamster to do exercise or have fun by itself. Specification: Material: Plastic Color: Blue / Pink(Optional) Size: 18 x 18 x 11cm / 7.09 x 7.09 x 4.33inch(Approx.) Package Included: 1 x Wheel spinner 1 x Base Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures. 1Made of high quality material, sturdy and durable. 2All finishes are non-toxic, safe and Eco-friendly. 3Anti-slip design, safe for the hamster to run. 4Easy to install and clean. 5Great wheel roller for you hamster to do exercise or have fun by itself.