Hand sharpened and tested before deliver. Most blades are mass produced and un even in close microscope causing your blade never to fully contact each other. Both the cutting blade and still blade are carefully sharpened and thinned, to create that tap and go line with that crunch sound. It’s crucial to have a good blade to prevent re lining in the same area that will cause irritation to the skin. Upon order, please allow a few days to sharpen and dialed in. They will come zero gapped, oiled and ready to go. Adjust your tension spring if need be.