Paw Pals Sponge Ball Cat Toy Multi Packs www.petco.com - $1.99 Product Description: Soft and squishy sponge balls take a batting and spring back into shape. Great for indoor cats. They're super soft, a big plus if you step on one your cat thinks he's hidden! RattyRat's Review: Rats pretty much just rip these balls apart into little pieces. We are not sure how safe these balls are for rats to chew on so we gave it a low score. If anyone finds that these balls are safe to ingest please let us know.