This is our JD Crowe thumb pick in a size medium. 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.