Soft poly 1 1/8" ball for 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 unwound models deliver maximum sound. With birch shafts for rigidity and consistency, they are favored by players who pe