The Rungne Magball keeps chalk where it belongs: on the fingers, not floating through the air. The refillable mesh ball meters out magnesium carbonate with each squeeze. No cloud of excess dust, no wasted chalk at the bottom of the bag. What Our Gearhead(R) Experts Are Saying:"I use this instead of loose chalk because the mesh controls how much comes out, enough to coat my fingers without dusting the holds or the floor of the gym."