Psychi's high performance pure magnesium carbonate. Our chalk comes in a handy resealable bag for spill free storage. The loose chalk ensures maximum grip and sweat absorption in any all situations to ensure a strong performance on your local wall or out on the rock. The product has been designed to dramatically reduce the effects of sweat and calluses. You can easily transfer the chalk to chalk bags and bouldering buckets. Psychi Rock Powder chalk is also perfectly suited to other activities such as Weight Lifting, Gymnastics and Pole Dancing.