D'Andrea Formula Delrex guitar picks provides players with an alternative material that addresses the issue of pick slippage. With a unique tone and articulation along with a matte finish, the Formula Delrex picks are a popular choice for all styles of guitar playing. The Sharkfin design allows you to explore tones that aren™t possible with a traditional shape pick. They are available in six gauge specific colors and ship in a 12-piece pack. Choose your favorite gauge from the drop down menu.