Requires 12x12 cutting mat. Display this dimensional message at the birthday celebration. Composed of built up welded blocky 'HAPPY' letters shape, with optional individual letter overlays, and a two-layer 'birthday' cursive word cut on front. Self "stand" is created with fold-together I-beam flanges with narrow side tabs that slide through slot back layer into an interior channel layer. (Precise alignment of all letter shape layers is essential for success! Take care to handle channel and slot shapes carefully when removing from mat.) Finished size is approx. 11.5" wide x 4" tall x 1" deep. View an assembly guide at http://needlesnknowledge.blogspot.com/2016/02/happy-birthday-i-beam-display.html. A SnapDragon Snippets design.