The Salyers Percussion E10 soft yarn mallet features birch shafts a rubber core and high quality wool/nylon blend yarn for a full round tone. The Etude Series is designed to be a high quality and economical solution for percussionists and band directors. The Etude Series is made with the same quality materials that you will find on many higher priced alternatives. The design craftsmanship and material selection set this series apart from other brands on the market today.