GLASSER, the company that patented the world's first fiberglass bow, offers this standard round fiberglass 1/2 cello bow that features a half-lined frog with a metal under-slide and an imitation three-part button along with genuine unbleached white horsehair and a leatherette grip. This quality cello bow offers students an excellent alternative to inexpensive wood bows because of itìs durability and it will not warp.