The D'Addario Six String "D" Mark is as recognizable as the colored ball ends of our strings. A proud symbol of our commitment to quality, precision, innovation, and responsibility, this lightweight, mid-profile hat boasts a “D” Mark patch sewn onto the front. This one-size-fits-all, unstructured, six panel hat has an adjustable fastener with metal clasp. It’s also ethically sourced, and packaged without plastic.