Black Foam Board (Standard Sizes) - Columbia Omni Studio
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Amazon.com: 8 Pieces Foam Boards White Foam Core Backing Boards, Silver Craft Knife with Protective Cap and 12 Inch Stainless Steel Ruler for Art Presentations Crafts Display Favors(12 x 10 x 0.2
Foam board, A4, 210x297 mm, thickness 3 mm, white, 10 sheet/ 1 pack