7 oz - 200 gram - bag of white loose chalk - magnesium carbonate - powder to dry hands and increase grip for all exercises and athletics &ndash; weightlifting, rock climbing, gymnastics, Crossfit BRYO Loose Chalk is made out of 100% magnesium carbonate to improve grip and dry out sweat Protects Hands Against Blisters by reducing the friction from exercise equipment, rocks, boulders, etc. Loose 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, bowling, etc. 7 oz. (200 grams) of chalk provides two refills for the BRYO Chalk Ball (5% discount for purchasing chalk ball and loose chalk together)