Heidi Swapp Mini Lightbox Alphabet & Numbers Mega Pack Inserts. Create even more clever phrases and fun decor for your Lightbox collection with the mini red mega pack. The mega packs include not only the alphabet but numbers and punctuation too! Color Red. Includes 100 pieces. 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.