The Darter Rosin is a little bag in pouch containing a turpentine based rosin powder. When you have sweaty palms, or if you like to have more grip while throwing your darts, you just have to apply your hands on the pouch a few time for the rosin powder to take effect, and strenghthen your grip.

This product is also used by rugbymen when it rains or rock climbers (this is not magnesia though).

100% natural product.
Small and easy to use and to carry. Can easily fit in a pocket without bothering while playing.