The CT55 is a pick custom designed by Chris Thile for his personal use. It is very similar in size and shape to the Blue Chip TAD line of picks. However it is only manufactured in 55/1000 of an inch(1.4mm) thickness and has a custom bevel per his specifications. This is the exact pick that Chris Thile is currently using. Not surprisingly it's our most popular pick with mandolinists, but is also well liked by many guitarists.