Powderized Gym Chalk is great for many athletic activities. This 450gms. bag of powder gym chalk is 100% pure powder chalk keeps hands dry for a secure grip for gymnastics or weight-lifting. Finest quality hand chalk in the world hand picks the suppliers for our Gym Chalk to ensure that it is the finest quality gym chalk in the world. chalk is made out of a magnesium carbonate that is velvet smooth. Our chalk is tested in independent labs, proving to be the purest magnesium carbonate quality. A case of our powder gym chalk contains 450gms bag. Use our gym chalk for rock climbing, weight lifting, and all around gymnastics.