Send your artwork to us "camera ready," meaning that it is in black ink on clean, unlined white paper or posterboard. You can also e-mail the artwork to us. Determine the total to the nearest image size; for example, an image area measuring 7 1/4" x 9 1/2" = 68 7/8 square inches and will be considered as a 70 square inch area. The MAGNESIUM MASTER PLATE is a one-time item used to form the matrix mold. Three thicknesses are offered. "Standard Etch" will create stamp printing characters that are about .040" high, suitable for most "business stamp" type of applications. "Deep Etch" will create stamp printing characters that are about .070" high which is most common for "art stamp" applications. "Extra Deep Etch" makes stamp printing characters that are about .100" high and are used for stamping on cloth, corrugated cardboard and other irregular surfaces.