The special feature of the Magnum Ball Refill is that you can easily refill and close the ball yourself.

Finest magnesium powder, called chalk or magnesia is ideal for climbers and boulderers. The powder absorbs moisture and thus provides the right grip for a variety of activities. Due to the special packaging in a permeable fabric ball, the release is reduced to a minimum.

Especially in closed climbing gyms it is very advantageous to use such balls, as this reduces the contamination of the air by magnesium particles.