Regular Postcard Backings. 3-1/2 x 5-5/8". 0.028" thick acid-free board. White both sides. Long-term storage.

Regular Postcard Backings
3-1/2 x 5-5/8"
0.028" thick, acid-free board.
White both sides. Long-term storage.
Acid-free board effectively captures and neutralizes migrating acids found in paper, ensuring long-lasting preservation and protection.

Use with: SPCR2, SPCR4, SPPPCR poly sleeves.