Promark Jim Wunderlich JW3 "System Blue" Medium Marimba Mallet The JW3 will cover the marimba from end to end, but have a particularly smooth, rich sound in the middle of the instrument. Length: 17" Head Size: 1.52 x 1.80" The JW3 features a rubber-like synthetic core wrapped tightly with durable synthetic yarn on a lacquered birch shaft for a smooth finish with maximum strength Durable enough for outdoor environments, but the lush tone of these mallets is an appropriate and tasteful choice for indoor concert or marching settings All Promark drumsticks are designed and manufactured in the USA