Psychi Chalk Ball for Rock Climbing Bouldering Gymnastics Gym Weightlifting Yoga Pole Dancing 56g Psychi Chalk Ball. Mesh covered to reduce dust & wastage. The stretched mesh lets out plenty of chalk each time to coat the fingers well but without losing too much powder and should last a good long time. Perfect for indoor climbing and gym work. Ideal for Rock climbing, gymnastics, weightlifting and pole dancing.