Ka-dujh

It's in the FAQ https://www.cgccomics.com/comic-grading/faq/ Is it necessary to get my CGC book reholdered after a certain number of years? No. The CGC holder is designed for long-term preservation and provides superior protection for your books. A properly handled and stored CGC-certified book can last for generations. The CGC holder is made from high-quality materials and is entirely archival-safe. The inner well that holds books, for example, is comprised of PETG, a plastic that is well known to be archival-safe and extremely clear. This PETG well is placed inside of a durable outer case that is sonically welded to ensure a secure, tamper-evident seal. For added long-term preservation, CGC inserts *MicroChamber® paper into vintage books prior to encapsulation. This MicroChamber paper helps to neutralize the natural acidity of some books by using a specialized, proprietary “zeolite” that was designed to absorb and hold the molecules known to damage archival collections. That is why MicroChamber paper is used by many of the world’s most respected museums and institutions, including the Smithsonian Institution, the Getty Conservation Institute, the Louvre, the British Museum and the Northeast Document Conservation Center. To further protect books from the natural off-gassing that releases acidic molecules over time, CGC has a secure sonic seal that is NOT airtight so that acidic molecules are not trapped inside the holder. *MicroChamber® is a registered trademark of Conservation Resources International, Inc.

I always use drafting dots.