Human Anatomy Elongated Ovals. Square Sizes ~ 13mm x 13mm, 16mm x 16mm, 24mm x 24mm, 32mm x 32mm. Rectangle Sizes ~ 18mm x 31mm, 31mm x 18.5mm, 22mm x 37mm, 37mm x 22mm. Piddix collage sheets are the highest quality collage sheets available on the market. They are printed on special order, medium weight cardstock which is perfect for all crafting applications and have been field tested with dozens of finishes including ICE Resin, Diamond Glaze, Glossy Accents and many more. Each collage sheet has a smooth, matte finish perfect for using under glass or epoxy stickers. Made in the USA. Each sheet measures 4.25 x 9.75 inches.