Laser-Engraved Golf Marker, Personalized for Free. We use 1-1/2" in diameter aircraft grade Alcoa anodized aluminum. Not magnetic. It is very strong and the anodized surface is super hard, even harder than stainless steel. It is 100% Made in the USA. Personalization Options: 1. First Name or Full Name Please include this information in the note section of your checkout or send through a message.