The Cat Exercise Wheel by One Fast Cat® is engineered for indoor cats to unleash their wild side and improve their well-being. Ideal for high-energy cats, this treadmill provides a safe and fun outlet for excess energy and encourages an active lifestyle. Cats can burn more calories and build muscle by running freely, whenever and for however long they want. Extensive field testing has shown that the wheel also reduces destructive and unwanted behaviors by alleviating stress and anxiety. The sixth generation is made in California using non-toxic, recyclable materials and features a sturdier and quieter design. Protected by US Patent 10, 182, 555.