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 MATRIX MOLD is a one-time expense. Order the Matrix Mold along with the Magnesium Engraving. It is placed in the vulcanizer with the raw rubber to form the actual stamp printing dies. Three thicknesses are offered to correspond to the Magnesium Master Plate etching (Standard, Deep and Extra Deep).