The Planet Waves 1CBK6-10 is a 10-pack of premium celluloid picks in black, heavy gauge. Celluloid is one of the most popular guitar pick materials today. Available in a wide variety of shapes, colors and thicknesses, celluloid is known for providing 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. Planet Waves, part of the D'Addario family of brands, is known for innovative, problem-solving, quality musical accessories. Planet Waves offers a complete line of award-winning accessories including cables, picks, tuners, capos, straps, humidifiers, maintenance tools and more.