High quality magnesium carbonate No additives Super fine feel Exceptional drying properties PURE-DRY-GRIP Szents premium gym product YChalk was created for the purist, YChalk is a magnesium carbonate chalk powder with nothing else added. It's super fine grind, ensures effortless hand coverage that lasts. YChalk is an all-round chalk suitable any activity where you just can't compromise on grip. purest magnesium carbonate, refined in the lab, with a fine grind to get deep into your pores and provide a long lasting dryness, meaning you will uses less chalk.