Do you remember the movie 'The Man With The X-Ray Eyes'? When I watched that as a kid all I ever wanted was X-Ray eyes, and although I never got them, I did get clear practice locks, which for lock picking, is just as good. Pinned differently each end, so two locks to practice one. When you can see what your picks are doing, you can see what you're doing wrong - and more importantly - what you're doing right! Dimple locks are no longer a mystery, clearly.