Black Diamond Loose Chalk Increase your rock climbing performance with the Black Diamond Loose Chalk. Made from magnesium carbonate, this loose chalk powder quickly gives you the right amount of chalk you want when you re climbing. It also reduces the moisture and sweating in your hands and stays longer than usual. Even if it is too humid or too hot, the loose chalk ensures that you will have a tight adhesion on holds to prevent you from slipping as you climb. Smooth and fine, the loose chalk doesn t make your hands feel like sandpaper, making climbing less irritating. The loose chalk comes in a 100 g bag, which makes it reusable especially for longer or more technical climbs. Whether you re bouldering or just wall climbing, the Black Diamond Loose Chalk will keep your moisture problems at bay for a better climbing performance, ensuring that you will feel secure as you make your way to the top.