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Intro and foam core board The Picture Framers Grumble
2.5mm MDF Backing Board Cut to Size
A4 A3 Chipboard Sheets Brown Kraft Cardboard for Scrapbooking & Picture Frame Backing (1MM 2MM Thick) Paper Board - AliExpress
Wholesale 5mm melamine backing board For An Economical But Sturdy Wood Option
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Jackson's : Backing Board Panel : 2.5mm MDF : 8inx10in
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MDF-2.5mm Stand Back 9 x 7, 18mm drop - Acorn Picture Framing Supplies Ltd
Cut-to-Size MDF Wood Backing Board Sheets - Profile Australia
Backing Boards - Mainline Mouldings
2.3 MDF Backing Board for Door Skin - China 2.3 MDF Backing Board, Cheap
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Jackson's : Backing Board Panel : 2.5mm MDF : 10inx12in