Professional grade Delrin® guitar picks. Delrin® is a registered trademark of E.I. du Pont de Nemours and Company. Measuring 1.2" x 1", these standard-style 351 guitar picks are made from Delrin®, a modern plastic that produces a very woody but warm sound. Extremely durable and with a matte finish that make it easier to hold on to the picks. Less rigid than celluloid, Delrin® is offered in a wider range of thicknesses than celluloid. Please note each of the colored Delrin® picks represents a different thickness. Red (.50mm), Orange (.60mm), Yellow (.73mm), Green (.88mm), Blue (1.0mm), and Purple (1.14mm). White and Black Delrin available in several gauges. Picks can be customized with a multi-color imprint of your choosing, on one or both sides.