Chalk ball 3 oz.100% pure magnesium carbonate powder suitable for weight lifting, cross training, powerlifting, gymnastics & rock climbingstrong grip, dry hands, no slip 4.7 out of 5 stars 59 $7.95 $ 7 . 95 A wide variety of gymnastics magnesium powder options are available to you, such as agriculture grade, industrial grade, and electron grade. there are 596 gymnastics magnesium powder suppliers, mainly located in asia. A wide variety of gymnastics magnesium carbonate options are available to you, such as food grade, agriculture grade. there are 3,611 gymnastics magnesium carbonate suppliers, mainly located in asia. the top supplying countries or regions are china, taiwan, china, which supply 99%, 1% of gymnastics magnesium carbonate respectively. Our 400 grams of pure magnesium carbonate powdered chalk is perfect option for gymnastics chalk, weight lifting chalk, mountain climbing chalk, powerlifting chalk, chalk for baseball, basketball, lacrosse, pole dance fitness and any activities need a dry grip!