Greenbone Wonderpet! Tennis Ball Toys, 2.5", 4 Pack Greenbone tennis balls are a fun, safe choice for dogs of all ages  perfect for exercise and training Feel confident about playtime - non-toxic, non-abrasive felt is safe for your dog's teeth Designed for interactive play between you and your dog  not intended to be used as a chew toy Prefect for toss, fetch, and tug game with your canine. Great activities to burn off those excess energy. Made from high quality, non-toxic and non-abrasive felt which won't wear down your dogs teeth