Glasser, the company that patented the world's first Fiberglass bow, offers students a good alternative to inexpensive wood bows, since they are more durable and will not warp. Our standard Fiberglass bows feature a half-lined bow frog with metal under-slide and an imitation three-part button. The Standard Fiberglass bows come in a satin black finish, have genuine unbleached white horsehair, and a leatherette grip.