Mike Balter 92BB Lexan Xylophone Hard Bells Mallets The Ultimate Series is designed to produce a full, rich, warm sound with a very strong fundamental. Heavily weighted rubber cores with a latex underlayment wound with an extremely durable synthetic material on slightly thicker and longer handles. Designed to produce rich sound. Hardness: Hard Model Number: 92BB The wide variety of the Ultimate Series makes them the preferred choice for every solo, ensemble, indoor or outdoor situation.