SEAL DISCOLORED AT BALL COLLISION POINT AND TO BE ADHERED ONTO GOLF CLUB FACE

PROBLEM TO BE SOLVED: To provide seal which is discolored at a ball collision point and which is adhered onto the face of an iron golf club and hardly adhered onto the face by inclination and by which an adhering position onto the surface of the golf club face is easily recognized and the position of a hit mark is easily compared with the position of a sweet spot of the golf club. SOLUTION: The seal has a shape enclosed by a heel side 9, a bottom bide 10 having a projected bending line, a top edge side 11 and a toe side 12 and has a vertical axial line 2 and a horizontal axial line 3, etc., on the front surface. Thus the position of the hit mark formed by a shooting practice is made easily comparable with the position of the sweet spot in the golf club and the seal is rarely adhered by inclination onto the surface of the golf club face.