Pro Penn Marathon Extra-Duty Tennis Balls, 3 Ball Can (4-Pack) red and black CONTAINS MORE COLLAGEN THAN BONE

CONTAINS MORE COLLAGEN THAN BONE BROTH: Collagen is enzymatically processed several times to leave its peptides intact

and slide backward to decelerate and brake

Brand: Perimeter Technologies

they withstand just about anything pets put them through

Pro Penn Marathon Extra-Duty Tennis Balls, 3 Ball Can (4-Pack) red and black CONTAINS MORE COLLAGEN THAN BONEBrand: Penn Features: Official Ball of the USPTA for over 37 years longest running endorsement in tennis history. USTA approved 3 Balls to a Can, 4 Cans to a Pack = 12 Balls Total Publisher: Pro Penn Details: Pro Penn Marathon is Penn's longest lasting tennis ball featuring exclusive Encore Technology for a 22% longer lasting core and high tenacity LongPlay felt for extended play. Pro Penn Marathon is the #1 choice of the USPTA Teaching Pros because