About D'Addario 2CA7-01CT Chris Thile Signature Casein Pick 1.40mm:
 
The Chris Thile Signature Casein Pick was developed to meet Chris’s own specifications for maximum comfort, tone, and playability. Casein gives players access to the texture and warm, balanced tone previously found only in natural tortoiseshell picks. The Chris Thile Signature Pick’s wide, triangular shape offers added control, and each corner’s beveled, pointed tip offers supreme glide and articulation.