These white foam trays are the perfect backgrounds for your works of art. Bulky craft materials like buttons, gravel, or sea shells often need a sturdy surface, and these collage trays will do the trick! Create stunning artwork using some glue and any craft supplies you have on hand. The foam trays are also useful for handing out project supplies in a class or group setting. Each pack includes 25 trays. Trays measure 9" x 11"