Some of the best PTS I've ever had made. These were uniform in thickness (no thinning towards margins), observed birefringences were right on the money for a 30 um thickness and even soft minerals in a hard matrix were polished to a high degree (no significant pitting or grain removal, no undue scratching). Communication was excellent with Sue and Dustin. Real please to work with and the price per PTS is right on the money. My students and I will work with them again in the future. Very highly recommend the business and team at Precision Petrographics.