Medium 9" Twister Bone w/2 Tennis Balls. Mammoth Flossy Chews are made from premium quality cotton-poly yarns with extra strength tennis balls that are ideal for interactive playing, tossing and tugging. Flossy Chews dog toys encourage playtime and bonding between you and your pet while helping to maintain good dental hygiene. Toss. Tug. Floss. Great for small to medium size dogs.