ProSource Professional Grade Gym Chalk for Cross Fitness, Weightlifting, Gymnastics and Rock Climbing; Magnesium Carbonate; 1lb (8 Blocks) PROFESSIONAL GRADE - 1lb of top quality magnesium carbonate chalk comes wrapped into eight convenient 2oz blocks for easy storage and less mess NON-SLIP SURFACE - Reduces moisture on the hands so you can perform exercises better and lift heavier PROTECTS PALMS  Helps protect hands for repetitive lifts like snatches, swinging movements like muscle-ups and kips, and rough surfaces like ropes IMPROVES GRIP  Great for holding onto bars during heavy weightlifting, and for use on bars and gymnastics rings for better stability and safety MULTIPURPOSE - Perfect for CrossFit, powerlifting, gymnastics, and rock climbing