Giuliani Carbon Fiber Bow 4/4 (Full) Size Highest-rated violin retailer on Amazon and #1-rated customer service in the U.S. The only carbon fiber bow backed by a lifetime warranty and 45-day money-back guarantee. Each bow set up and inspected by Kennedy Violins' professional luthiers in Washington State. All bows come pre-rosined and ready to play the moment you receive them. Handcrafted with solid carbon fiber with high strength-to-weight ration, Mongolian horse hair, 100% genuine ebony frog, real black leather grip, and beautiful abalone accents.