The FG Violin Bow with Replaceable Horsehair is made of fiberglass and is well-balanced, with an agile shaft. Features a warm brown finish and black plastic frog with premium replaceable horsehair, faux whalebone lapping and leatherette grip. Will not warp in damp or hot conditions and spring tension is built in for life even when left on full load for weeks. Replacement horsehair hanks sold separately.