Personalized 18mm Round Shape 925 Sterling Silver ID tag Dog Tag Platinum Plated - Free Engraving IMPORTANT!! How to Submit Engraving Details. After you make the purchase please contact us via amazon (Contact Seller) to submit your engraving details. Free State of The Art Laser Engraving Engraving text Can be engraved on both sides!unlimited of text,but suggest 5 lines of text, 12 characters per line second picture is the sample,can use it as reference Size: 0.71 inches x 0.71 inch. 1.8 cm x 1.8 cm. Thickness: .04" (1 mm)