The Birdie Bag is made from a thirsty blend of kiln dried wood powder. Simply pat the Birdie Bag on your hands or disc and wipe off the excess for a natural-feeling dry grip. The wood particles expand two to three times their size to absorb unwanted moisture and oils without leaving a sticky residue like chalk and rosin. With multiple world champions & top pros trusting their grip to the Birdie Bag since 1996, it has become a staple in disc golf. The Birdie Bag leaves hands dry -- for a no slip grip!