Shell celluloid guitar picks by Planet Waves. Pack of 10 picks.

One of the first polymers ever created, cellulose nitrate is made by reacting cotton fibers with nitric acid. Cellulloid was substituted for natural toroise shell picks in the early 1900s and is still one of the most popular pick materials available today. They are available in a wide variety of thicknesses, shapes, and colors, and provide a natural feel and warm, fat tone.