The ES1R is ideal for the lower range of the marimba or for a warm tone with little articulation on vibraphone. Length: 16 3/8" Head Size: 1.625 x 1.25". This graduated series offers the many choices for the perfect mallet regardless of range on the instrument. The Ensemble Series is a great choice for percussion ensembles, marching applications and marimba choirs. All Promark drumsticks are designed and manufactured in the USA to the most stringent quality controls in the industry. .