Ring shape: Inner diameter is 20mm and outer diameter is 30mm. Lightweight: Acrylic sheets are lightweight and can be cut or drilled with clean, precise cuts without cracking. Double-sided film: Each sheet is covered with a protective film on both sides for removal upon receipt. Cutting and drilling: Sheets can be cut using hot or cold methods including laser cutting, table saws, jigsaws, and drilling. Multipurpose projects: Suitable for various projects such as picture frame glass replacement, artwork covers, desktop mats, DIY models, greenhouses, aquariums, and more.