These toys are designed to provide cats with both mental and physical stimulation, as well as offer a source of entertainment and relaxation.
The mouse shape of the toy can also appeal to a cat's natural instinct to hunt and pounce on prey.
These toys can come in various materials, such as plush or felt, and may also feature additional features such as feathers or strings . The toy's size should be appropriate for your cat to carry and play with comfortably.
When introducing a new  toy to your cat, it's important to monitor their behavior to ensure they are not playing too aggressively and potentially harming themselves or others. 
Overall, the toy can provide cats with a fun and stimulating way to play and satisfy their natural instincts. However, as with any cat toy, it's important to choose toys that are safe and appropriate for your cat's size and behavior.