3X White Mounting Board two white sides - both buffered, acid-free surface papers; Heavy weight
No. 91 Presentation Board double-sided presentation for mounting and displaying artwork. 50 % Gray and 80% Gray; High-quality surface papers on a black solid core. Medium weight (.052)
Chipboard economical; buffered, non-conservation millboards for backing and mounting; unfinished gray surface
No. 20C Heavy weight, .080 thickness (3/32 in. thick)
No. 40C Medium weight, .040 thickness
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