Quest Athletics Gym Chalk 4 Oz Powerlifting Crossfit Weight Lifting Chalk - 2 Blocks 100% Pure, Premium Quality Magnesium Carbonate; Professional Grade; Each block is individually wrapped in paper; (2) Blocks in this listing. Total net weight 4.0 OZ; A must-have for Powerlifting, Olympic Weightlifting, Gymnastics & Rock Climbing.