Medium = 2.5"" diameter ball fits Chuckit! Pocket, Junior, Classic, Ultra Grip, Pro 18M and Pro 25M Ball Launchers
Please do not leave unsupervised with your pet.
Caution: Proper supervision is advised when playing with all toys to ensure no accidental swallowing. This toy should be regularly inspected to ensure there is no damage. If any damage is seen the toy should then be discarded.