Pure Magnesium Carbonate Chalk for Climbing & Powerlifting (USA-Made) Spider Chalk manufactures pure, lab-grade magnesium carbonate block chalk in 8oz (220 grams) Mega Blocks. Lasts Longer - Pure chalk lasts longer on your hand and has better grip with superior drying ability. More Dense - Our manufacturing process makes the blocks less brittle so they don't break into pieces and make a mess. More Chalk - Spider Chalk Mega Blocks are 3x the density of standard blocks. Pure Chalk - Other blocks turn slimy when you sweat. We use only magnesium carbonate with enhanced drying ability even in sweaty environments. Made in the USA - All conventional 2 oz blocks are made in the same factory and private labeled. We are the only chalk company that manufactures blocks in the USA, and we're proud to make Mega Blocks at our facility in Atlanta, GA. Sanctioned For Powerlifting - Approved for all IPF and USAPL Powerlifting competitions. Used in Hyrox and CrossFit events. NEW XEROLITE™ Option - Mega Blocks with XEROLITE™ for Advanced Moisture Control. Mega Blocks last 2x longer than conventional blocks1 lb Spider Chalk = 2 lbs of regular blocks. We are the only manufacturer of climbing chalk and weightlifting chalk in the USA. Our process ensures that your blocks last longer, create less dust and grip stronger. Mega Blocks 2 lbs - $42.95 (free shipping)XEROLITE™ Blocks 2 lbs - $48.95 (free shipping) 2 lbs of Spider Chalk is equivalent to 4 lbs of regular 2oz blocks sold in packs of 8 per box. Read reviews to confirm that Mega Blocks SAVE money by less wasted chalk. Gyms, weightrooms and climbing facilities all across the USA (and in 21 countries) use Spider Chalk Mega Blocks, and they are now the standard for any weightlifter, powerlifter, gymnast or rock climber. We do not use fillers, binders or drying agents. Our manufacturing process produces a denser, cleaner and more pure block. 8 oz Mega Block Dimensions:Weight: ~220 GramsLength: 4"Width: 3.5"Thickness: 2.5"2x 8oz Blocks Per Box = 1lb Chalk XEROLITE™ has higher drying ability and increased friction compared to magnesium carbonate chalk. Grip loss does not occur because chalk “runs out” but because moisture overwhelms the material’s ability to manage hydration. XEROLITE™ addresses this at the materials-science level, delivering higher absorption capacity, longer functional dryness, and more consistent friction during high-output training. XEROLITE™ outperformed conventional chalk in testing across multi-modal domains including weightlifting, armwrestling, pickleball, tennis, golf, pole, disc, shooting, gymnastics, powerlifting, strongman, Ninja, CrossFit, Hyrox and track & field. ---- What Spider Chalk Is:Pure magnesium carbonate chalk products manufactured in the USA. Designed for maximum dryness and grip. Ideal For: Rock climbing Bouldering Weightlifting / Powerlifting CrossFit & Hyrox Why It’s Better: 100% lab-grade MgCO₃ Zero fillers or drying agents Consistent hardness — Mega Blocks don't crumble prematurely Longer surface life per application Specs: Weight: 8 oz block Material: MgCO₃ Manufacturing: USA Material Tags: magnesium carbonate pure MgCO3 lab grade chalk XEROLITE™ Use-Case Tags: climbing chalk powerlifting chalk gym chalk weightlifting grip crossfit chalk Category Tags: chalk block chalk powder USA made
