These are a first of their kind! A true innovation to the standard low quality foam inserts that Perky Boxes are known for. These 1/4in Thick bases fit flush. They add so much value and attention to the Perky Collectors presentation. Leave it upto Display Base Co. to come up with this classy one of a kind solution to an age old problem! We use the finest Cell Cast Museum Grade Acrylic. All of our products are made in house in the USA. We are a proud small business developing solutions for the collecting industry. All orders are custom cut. We offer a variety of thicknesses, dimensions, shapes, rounded corner options, and beveled edge options. We thank you for visiting and hope to make your collection shine! Have a great day!