The Jim Casella Series keyboard mallets are designed to the specifications of leading marching percussion specialist, Jim Casella. This series has been designed to meet the demands of both the indoor and outdoor marching percussion ensemble. Each marimba model features a rubber core for maximum projection and the warmest fundamental tone. The IP1003 hard marimba mallets feature: Variety of rubber cores and latex combinations to create a full, rich tone and warm fundamental · Highly polished Birch handles · Specially designed, extra-durable synthetic off-white yarn heads with a concert hall timbre