Specifications: Constructed of non-toxic material, durable& safe to play. Ideal for hamster, mouse and other small furry animals. Relieves boredom and increases activity level and giving him a fun spot to play. The sports wheel adopts an overall transparent design, and the owner can observe the whole process of pet sports. Type: Hamster Training Wheel Material: Plastic Features: Lightweight, Transparent, Durable Size: 12cm/4.72", 15cm/8.91" (Approx.) (Optional) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hamster Training Wheel (Hamster Not Included)