J. LaSalle LB-20 Carbon Graphite Deluxe Student Violin Bow - 4/4 Size Modern, round, carbon graphite stick engineered for balance, flexibility and perfect intonation Traditional non-slip sheepskin cushioned wrap gives optimal comfort Full-mounted ebony frog with silver-plated button provides enduring beauty and an incredibly balanced bow feel Premium, genuine unbleached horsehair ensures long-lasting durability and the apex in rosin adhesion 4/4 size violin bows are also suitable for use with 12-13 violas