Amazon.com: Smoothfoam Cube Crafts Foam for Modeling, 5-Inch, White : Arts, Crafts & Sewing
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Amazon.com: Juvale 6 Pack Foam Cube Squares for Crafts - Polystyrene Blocks for DIY, Floral Arrangements, Arts Supplies (4 x 4 x 4 in, White) : Arts, Crafts & Sewing