B1 Prinz Single Sided Page (10 pages per pack)
Pockets are made of inert polyester film. Polyester is the safest, clearest film known for safety storing valuable collectibles.
The backing board is 270 gram cartridge and is especially formulated not to give off color, ph value of board is adapted to stamp paper.
Adhesive is 100% synthetic rubber and is completely chemically inert and permanently elastic.