Bison chalk uses pure, natural magnesium carbonate. This athletic chalk is ground to produce a high number of points per particle for superior friction and then baked completely dry for maximum moisture absorbency. The Chalk Ball minimizes environmental impact by eliminating spills and significantly reducing excessive chalk on holds and in the air at gyms. The B3 Chalk Set also includes the Big Dipper, a mid size chalk bag styled in brushed cotton canvas. Hold it all up with the Ultra Light Chalk Bag Belt, constructed of 3/4" webbing with side release buckle. Assorted colors.