TOOGOO(R) Roll Playing with balls in Sisal Scratching Post for Cats Colors Random Made of natural sisal, pets are sensitive to the smell of sisal. There are 3 balls inside with ring; Cats want to drive them out but they could not. Specially used for cat scratching post, so you do not need the sofa or furniture damage caused by scratches from cat. Ideal to accompany the animals when the owners are not home.