25 crystal clear Current Age sized backing boards per pack.

Comic Clear backing boards are made of 100% archival, acid-free and completely transparent PET plastic. They will not discolor over time or absorb off-gassing from comics as they age. This makes them the only backing board that doesn't need to be changed out every 3-5 years. Each board is covered on both sides with an easy-to-remove film that ensures every board is free of scratches and scuffs. 

Comic Clear Current Age boards fit comics made since 1970. Sized slightly wider than Current Age comic books, these boards provide an extra margin of protection on all sides. Fit all major brands of Current Age sized comic bags.
 
Quantity: 25 boards/pack
Dimensions: 6.75" x 10.5"
Thickness: 0.8mm
Material: archival, acid-free plastic
Easy-to-remove protective film ensures boards remain scratch and scuff-free