OFFICIAL SIZE + WEIGHT: These lax balls are 63MM in size and 5.25 +-.25 ounces in weight to meet official lacrosse size and weight standards PEAK PERFORMANCE: Constructed of 100% vulcanized rubber, these lacrosse balls are perfect for players of all skill levels! Play with confidence knowing these were designed with performance and quality in mind MULTI-PURPOSE: These lacrosse balls are ideal for training and recreational play but also double as muscle relief aids! Ideal for yoga and muscle flexibility, they can help increase mobility and aid in recovery MASSAGE THERAPY: Simply lean on the ball with your body weight and roll through your muscle to relieve muscle knots and tension. Great for relieving stress and tension at home, at the office, or in the gym! 6 BALL PACK: This set comes with (6) yellow balls included. All are official size and weight and ready to train, play and score!