The Innovative Percussion IP300 Soloist Series Medium Hard Marimba Mallets are slightly harder than the IP275 model and are designed for use in the upper 4 octaves of a 5 octave marimba. This model features 100% wool yarn, birch handles and hard rubber cores that help to create a full, rich tome and warm fundamental. Designed with the marimba virtuoso in mind, the Soloist Series is constructed using hard rubber cores, covered in a series of latex combinations. The mallets are wrapped is a 100% wool wrap, custom manufactured specifically for Innovative Percussion, which delivers a brilliant, rich tone with the warmest fundamental possible in all registers of the marimba. The series is offered on birch handles that are polished for the smoothest natural finish. Each step of production insures a mallet designed to meet the highest standards of today's most demanding marimbist.