Refillable 3 oz Chalk Ball Sock - Magnesium Carbonate - with No-Mess Storage Bag to dry hands and increase grip for all exercises and athletics - weightlifting, Crossfit, gymnastics, rock climbing Made From 100% Magnesium Carbonate and a No-Mess Bag is included for clean, easy storage Chalk ball reduces the use of excess chalk, making your chalk last longer Reusable Chalk Ball drawstring allows you to refill the ball with more chalk Chalk is used for all exercises: weightlifting, rock climbing, gymnastics, yoga, and Crossfit Also serves as a great alternative cure for sweaty hands in other sports: tennis, golf, baseball, etc.