The D'Addario Duralin Pick line features the widest gauge options of al the pick materials. The assorted gauge pack will help you find the perfect gauge for your playing style and experiment with other gauges. Duralin (also known as Acetyl or Delrin) is a unique material with an extraordinary combination of strength, stiffness, dimensional stability, fatigue resistance and low friction. Normally used as a replacement for metal bushings and bearings in industrial applications, this extremely durable polymer is ideal for picks. Duralin picks are known for their bright "licking sound when hitting strings and are preferred by many soloists for their clear articulation on fast single note passages.