D'Addario Planet Waves DuraGrip, by D'Addario 1 pack of 1.5,1.2,1.0,.85,.70,.60mm and 1 pack of 6 .60, DuraGrip guitar picks are made from D'Addario 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. Unlike other standard delrin picks, DuraGrip features a unique, stamped checkerboard surface that gives superior grip while playing. Take a look at my other items