D'Addario 1UCT4 STANDARD-PICK-CELLULOID-CORTEX-MEDIUM 

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. Attack, control, clarity and durability…Cortex Picks!