Better Office Products' 30-Pack of 9in.
yellow foam sheets are made of sturdy EVA..EVA Foam Sheets, 9 x 12 Inch, 2mm Thick, Yellow Color, for Arts and Crafts, 30 Bulk Sheets, 30PK The sheets are 2mm thick for easy cutting, bending, and wrapping so your arts and crafts project turn out perfectly! x 12in.