Diameter options?
Magnetized or only "will stick to magnet"?
Kudos
Update & observations:
A narrow market of DAILY golfers are the Seniors with lots of time & money to spend on this.
Their putters have ball pick-me-ups, sometimes at both ends to avoid the aches/pains of bending over that far.
Ergo their markers are worth x-tra $$$$ if magnetized so their putter can lift it up, stick on hat clip or 0.9"diam divit tool after they toss it down near ball, then pick-me-up the ball.
These seniors crowd the public courses at dawn, all morning so that open tee times are rare.
Maybe such a crowd of potential sales might interest you?
I just got some strong 6# thin magnets to serve, some college metal/weak mags to return to Amazon crooks, etc so the quality end of this market is all yours.
Be sure to have an iron clad licensing agreement with TAMU ...........
Gotta draw since me got no grammar