Go!CatGo! Large Mylar Crinkle Ball is so crinkly and enticing for your cat! Your cat will love it! Amazing Pet crinkle ball is a great activity toy for your new cat or kitten. It has a crinkle sound just like a mouse walking through leaves. The crinkle sound drives cats crazy, and they must have it! Measures 2.5 inches round. Sold as 1 each.