GReddy Fairway Snapback Golf "perforated back, sport" Hat - Black 

* ball and tee not included. (**GReddy Golf Marker not sold in the USA)

Clip type golf marker.
It is a type that is used by attaching it to the brim of a cap or sun visor, and is currently the mainstream. I think most golfers have used it once.
The pedestal and marker part are magnets, and it is popular because it is easy to use because it can be attached and removed with one hand.

【size】
Clip part: 23.5φ

【material】
iron with magnet