#face.surface  the striking or working surface of an implement
  supertype:  #surface  the outer boundary of an artifact or a material layer constituting or resembling such a boundary; "there is a special cleaner for these surfaces"; "the cloth had a pattern of red dots on a white surface"
  part of:  #head.striker  the striking part of a tool; "the head of the hammer"
     part of:  #hammer  a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking
     part of:  #ram  a tool for driving or forcing something by impact
  part of:  #racquet__racket  a sports implement (usually consisting of a handle and an oval frame with a tightly interlaced network of strings) used to strike a ball (or shuttlecock) in various games

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