KEEP PURELY MOISTURE FREE HANDS WITH THE BLACK DIAMOND PURE GOLD CHALK. Having Black Diamond Pure Gold Chalk with you on all your climbing trips will ensure you have the best moisture absorbing chalk. Simply mix this with your full chalk bag to get the most out of every ounce of chalk you use. This additive free loose chalk will keep you on the wall with moisture free hands. FEATURES: Single serving sized for filled chalk bags Upsalite (magnesium carbonite) Climbing chalk