This is the BlueChip JD Crowe thumb pick in a size large. This pick was designed by JD Crowe and constructed to his very exacting specifications. The BCT-JDL is the exact pick that JD uses. The pick bears JD's initials on the inside between the rivets. It is constructed using a custom designed stainless steel band and a 50/1000 of an inch(1.25mm) thick BlueChip pick. These picks are laser etched, professionally machined, and hand beveled to create the best thumb pick available.
This is the best thumb pick I have ever used. I strongly recommend it. You will notice the better tone this pick brings, as well as how comfortable it is.