It is made similarly to a basketball on the inside and is therefore sturdy and strong but its soft felt exterior makes it look and feel just the same as a tennis ball. This tennis ball is perfect for dogs of all sizes and it is great for running around in your backyard when you want your dog to enjoy some play time and some exercise.   It is a ball that is super thick and durable and its soft texture is sure to please your dog for as long as you own it.