"These balls are the best pet toys in the world! Out to the millions we spend on my 1 year old cat these are the ones she plays with the most! She finds the sounds interesting, and they have small sizes so they are puuurrfect for her to bat around, toss in the air, hide, and have fun with. And another good thing about them is there is no “set up” needed (like batteries) to use these balls and you can play with them as soon as you get home with your pet! They are so cheap too! If I were to go to the pet store I could buy a bigger more expensive toy that she wouldn’t play with or these small balls she loves for less then a dollar I would buy the balls. And you can buy a ton of them for the same prize as a bigger toy. And they are not JUST for cats, like some others said and my friends say their pets (Like birds, small mammals, and etc.) LOVES these just as much as my Kitty loves them!!! All in all every body who is reading this you MUST buy this for your pet because all pets love them, they cost less, and there is not “set up” (like batteries) and you can play with them as soon as you get home. These are the best you have to buy them!!!!"