The perfect assortment from experienced players with varying playing styles to beginners testing out different pick gauges. Assortment includes White Pearl light picks Red Pearl medium gauge picks and Black Pearl heavy gauge picks. 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.