D'Andrea Formula Delrex guitar picks provide 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 355 triangle picks are a popular choice for guitar players and bass players due to their larger gripping surface and tri-point design. They are available in six gauge-specific colors and ship in a 12-piece pack. Choose your favorite gauge from the drop down menu.