This 10-pack assortment of medium Classic Pearl Celluloid Guitar Picks from Planet Waves is made from premium celluloid and provides a natural feel and fat tone. The standard size and shape of the picks, at 0.70mm thick, offer comfortable playing. A man-made material, celluloid was first introduced in the early 1900's as a substitute for natural tortoiseshell picks. The D'Addario-branded pick packaging is designed for minimal waste and environmental impact.