This pack contains 8 of the half inch chips, 2 of the 3/4 inch chips, and 2 of the one inch chips. The mix is a great way to add variety and sample out some of our most popular designs. Laser etched in our lab in Ashland Oregon, we use our vibrant dichroic coatings and test each run for quality assurance. For flame working. COE33 borosilicate glass.