Franklin Sports Lacrosse Balls are official size and weight which makes them perfect for the backyard, at recess or for any sort of training or recreational play! They are official size 63mm in diameter and 5.25+-.25 ounces in weight. They are multi-purpose lacrosse balls ideal for training and recreational lax play and they also double as muscle relief aids! They can help increase mobility and aid in recovery and they are ideal for yoga, body maintenance & flexibility! They can be easily used for massage therapy by simply leaning on the ball with your body weight to allow gravity to relieve muscle knots and tension. Plus you can use them anywhere that is convenient for you, whether that be at home, in the office or at the gym! Constructed of 100% vulcanized rubber this set is perfect for training by players of all skill levels! Play with confidence knowing these were designed with performance and quality in mind. All balls are official size and weight and ready to train, play and score!