The R&A - Working for Golf
Committee Equipment Requirements
The Equipment Rules
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Committee Equipment Requirements
This section covers items of equipment which are not a player’s responsibility, but that are used by the player during the round.  These items may still be required to meet certain specifications to allow the game to be played to the Rules of Golf.  It is the responsibility of the Committee to ensure that all such items of equipment meet the requirements laid out in this section.
The Flagstick

a)  Definition: The Flagstick is a movable pole provided by the Committee that is placed in the hole to show players where the hole is.  The flagstick includes the flag and any other material or objects attached to the pole.

b)  Requirements:

The flagstick must be:

(a)  circular in cross-section, and

(b)  less than or equal to 0.75 inches (19 mm) in diameter from a point 3 inches (76.2 mm) above the ground to the bottom of the hole and no greater than 2 inches (50.8 mm) in diameter at any point.  Exceptions may be made for location indicators of a reasonable size attached to the flagstick.

The flagstick must not:

(a)  incorporate features, including materials, designed to act in a shock absorbing manner or have shock absorbing properties upon impact with the ball, or,

(b)  have features or properties which are designed to unduly influence the movement of the ball, or

(c)  have attachments which are designed to allow a player to determine wind speed.