Plain brown sheets constructed of one 175 test C flute and one 32 ECT B flute test which give you a 200# bursting strength. Approximately 5/16 thick.
Corrugated Cardboard Sheets 4mm - 3/16 Thick 5x7- 5 Pack. Filler Insert Pads, Brown Frame Backing Rectangular & Square Flat Boards for Art&Crafts, DIY Projects, Mailing,Dividers & Packaging
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