The Planet Waves 4CSH4-5 is a 5-pack of medium-size, shell-colored finger picks produced from the highest quality celluloid. Celluloid is one of the most popular guitar pick materials today. It's available in a wide variety of shapes, colors and thicknesses, and provides a natural feel and warm, fat tone. A man-made material, celluloid was first introduced in the early 1900's as a substitute for natural tortoise shell picks.