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. Their 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.