Foam board cutters and knives. Foam board, or foam core, is a strong, lightweight, rigid material perfect for presentations, signs, architectural models, mounting, and more. It's smooth surface accepts screen printing, glue, paint or markers, and cuts cleanly. X-ACTO foamboard knife is designed specifically for cutting foamboard, foam core, and some mat board. Rabbet cutters are uniquely designed to cut 3/16" foam board to create perfect 90-degree rabbet edges and joints. An essential tool for model builders. X-ACTO and Alvin foam board knives, foamboard cutters. Foamwerks circle cutter provides easy circles to be cut in Foam Core. Replacement blades available for all foam board knives.