Heidi Swapp-Lightbox Word Strips: Arrows. The perfect addition to the Heidi Swapp Battery Operated Lightbox (sold separately). Design custom signs for parties, evens and home decor! This package contains three 3×12-1/2 inch word strips in three designs, one 3×7 inch word strip and one 3×4-1/2 inch word strip. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Imported.