Golf club including externally invisible marker and non-destructive inspection techniques thereof

Abstract

A golf club head includes a toe; a heel; a hosel; a striking face configured to strike a golf ball and extending between the toe and the heel; a rearward portion extending rearwardly from a perimeter of the striking face; and one or more externally invisible markers located within the golf club head and configured to identify an attribute of interest of the golf club head, wherein the one or more externally invisible markers are configured to be identified by a non-destructive imaging process.

Dependencies are inferred from the claim text.