The present invention is a radio wave absorber having a high absorption performance for an electromagnetic wave of a high frequency and made thinner. A well screen connection can include well screen connectors, and a resilient ring received in annular recesses formed in the respective well screen connectors, projections extend from opposite ends of the ring and are received in an opening formed through a wall of one of the connectors, and the projections received in the opening prevent rotation of the ring relative to that connector. The attachment element is configured to attach to the attachment portion of the pin element, and is positionable at the attachment portion and is retainable thereto. Accordingly, the viewers visual experience is substantially enhanced by knowing in advance of the player’s putt, the line which the ball must take to the cup.