Bounce this large bouncy ball really hard until the glow capsule within cracks and breaks open causing this unique bounce ball to glow brightly for 4-6 hours! This glow ball makes an excellent hand out as a glowing party favor at birthday parties or as a prize! Use this cool glow bounce ball as a stocking stuffer, too! Play late into the night with this cool green ball. Colorless plastic before activation. Glows one time only.