SmartLab Toys Sew Science: Cuddly Critters Create a snuggly family of light-up forest friends! When the trio hold hands, the circuit is complete and the plushies glow! Includes 4 sewable LED lights, heard-shaped battery holder with 2 lithium batteries, 3 meters conductive thread, 4 die-cut felt squares, 3 sets of snaps, 8 meters embroidery thread, 1 plastic sewing needle, 1 oz. stuffing, pamphlet STEM Focus: Electronics For ages 8 and up