The Wheeky™ Treat Ball for GUINEA PIGS, RABBITS AND ALL SMALL PETS is an adjustable-opening treat ball that is a great boredom buster for guinea pigs, rabbits, rats, and all small pets. With just a little training (or maybe none at all), your pet can enjoy hours of fun and enjoyment with this colorful, adjustable treat ball. It is bright yellow with carrot images, and is 7 cm (2.8 inches) in diameter. The Wheeky™ Treat Ball for GUINEA PIGS AND SMALL PETS is not a chew toy, but an interactive treat ball that provides a fun mental and physical workout for your pet. Put your pet’s favorite kibble or small treat inside (we recommend diced carrot), adjust the size of the opening, then sit back and watch the fun! As your pet rolls and pushes the treat ball, food falls out, thus encouraging more play. Please supervise your pet when they are playing with this and any other toy. Includes a simple, easy-to-follow training guide.