Comic Book Acid Free Backing Boards - Bill Cole Time Extenders #24. Measures 7 3/8 x 10 3/8 for Silver/Golden Age Comic books. New and sealed. There are 50 boards per sealed package. I have a few packages. TIME-X-TENDERS™ is a pure, bright white heavy weight board (42 mil thick) and is the highest quality board available.
These sell for $30 ea. (US) plus shipping from Bill Cole Enterprises