Yeti Strong 2 Oz Refillable Chalk Ball for Gymnastics, Climbing and Weight Lifting 100% pure Magnesium Carbonate Chalk Ball (Powdered chalk in a cotton sack) - 6 Pack Greatly improves grip for gymnastics, rock climbing, bouldering, weight lifting, etc... Less messy and lasts longer than powdered or block chalk Best Chalk for Gymnastics, Climbing and Weight Lifting Used Worldwide by professional Rock Climbers, Gymnasts and Weight Lifters