Rungne Magdust Pro packs 100% chunk chalk around a single goal: maximum friction at the moment of commitment. Chunks coat hands more evenly than loose powder and stay put longer on the hold, which matters most on the moves where hesitation isn't an option. What Our Gearhead(R) Experts Are Saying:"The chunk format lets me break off exactly as much as I need and grind it into the holds. No cloud of wasted powder, just dry, sticky coverage where my fingers actually contact the rock."