Color: Pack of 2 (Penguin & Greenie) Adjustable Elastic Rope: The rope measures about 78.74”/ 2 m long, with elasticity and a buck for adjusting proper length for kittens to play with, making Teaser toys more fun. Self-play Teaser Toy with Catnip & Silvervine Fruit allows cats to play with them for a long long time. When cats touch or pull these slings, they will bounce left and right so that you cats start chasing them, which is good for indoor cats’ exercising. Easy to Install: These hanging toys can be stuck to any flat and smooth surface, such as ceramic tile, glass, marble etc., simply peel of the protective film at the back, and then stick it to the area that you would like to, and press it to make it stay firm, not easy to fall off. Ring Bell Design: The ring bell can be attached to the rope and easy to take off when you do not need the ring bell. Attaching it to the ring bell makes a sound when cats play with the mice toys so that you know your kittens are having fun with these mouses toys.