Hard phenolic 1″ ball. For all-around playing on bells and xylophone. – The American Custom® Keyboard Mallets are designed to address a range of instruments and all dynamic levels. The yarn models feature a 3-ply nylon yarn that is virtually indestructible yet provides excellent cushing for a softer sound. The cord model is wrapped with a harder finished material which produces a stronger percussive effect. The unwould models deliver maximum sound. With birch shafts for rigidity and consistency, they are favored by layers who perfect extra reach without the added flexibility of rattan. All Custom mallets are 16″ long.