MARTI MICHELL-Perfect Patchwork Templates: Storm At Sea Diamond Template Set. These templates are perfect for hand or machine piecers. Each laser-cut acrylic template features a perfect 1/4 inch seam allowance so you get specific-size pieces with no guessing! This set includes 2 pieces. A. WARNING: This product can contains chemicals including Poly(methyl methacrylate) which is known to the State of to cause cancer. For more information go to www.P65Warnings.ca.gov.