Md 20" Color 3 Knot Tug w 3" Tennis Ball. Mammoth Flossy Chews are made from premium quality cotton-poly yarns with an extra strength tennis ball that is 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.