We start with our thicker (0.6 mm) XTR, high-chromium spring steel Flexi Plates, powder paint them with Ultem brand PEI coating and bake them in a kiln. The PEI Powder Painted Flexi Sheets have a pronounced texture and give the bottom of your part a fantastic finish! The plates are coated on both sides, so you can save one side for pristine parts while you abuse the other side. Works perfectly with your Wham Bam magnetic base, not included.