Foam Ninja Polyethylene Foam Sheet 12 x 12 x 1/2 Inch Thick - 2 Pack Black Charcoal - Custom Foam Inserts High Density Closed Cell PE Case Packaging Shipping: Amazon.com: Industrial & Scientific
6 Sheets - 12" x 12" x 2" White PE Closed Cell Foam Plank, 2.2# Density | eBay