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