Cortex picks are precision molded to eliminate grain structures, allowing for dynamic pick response. This unique material closely resembles actual tortoise shell in feel and sound yet offers high strength, durability and heat resistance. Cortex long lasting picks offer excellent attack with a clean, crisp tone for superior note definition, allowing notes to leap from your strings. D'Addario is known for innovative, problem-solving, quality musical accessories. D'Addario offers a complete line of award-winning accessories including cables, picks, tuners, capos, straps, humidifiers, maintenance tools and more.