Stick without the ick! 100% Natural Pine Rosin Tight polyester material allows micro crystal release Includes: resealable storage pouch Tight polyester material allows micro crystal release Bring on the stick without the ick! Annex Pro Rock Rosin Bag is 100% natural, non-toxic pine rosin. Rosin provides a dry, tacky, secure grip that is great for pitching and hitting and has been used for generations. Each rosin bag is tightly sewn and woven to release micro crystals of rosin on every slap to the bat, glove or hands. The rosin bag comes with a resealable poly pouch.