Low Noise Exercise Roller for Hamster, Hamster Running Wheel, Durable Safe Rodent Animals for Hamster Pets Specification: Features: Made of superior wooden material, tough and durable to use. All finishes are non-toxic, safe and Eco-friendly. All parts are rounded smooth, no burrs, avoids hurting your hamsters. Low noise design, prevent the owner from noise when the hamster is running on the roller. Perfect exercise roller for your hamster to have fun and do exercise. Specification: Material: Wood Optional color: Green / Pink / Blue Size: 19x19x7.5cm / 7.5x7.5x2.9inch(Approx.) Package list: 1 x Wooden hamster running wheel 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.