Turn this light up terrarium into a magical underwater mermaid world. Everything you need is included. Your complete set includes ready-to-grow crystal coral, buried treasure, a squishy starfish and beautiful mermaid stickers. Add the shells and sand and watch your terrarium Glow-in-the-Dark! Crystal growing is a fun and easy to do science experiment. Just add hot water and watch your crystal coral grow in as little as 24 hours. Terrarium measures 4 1/4 inch h by 6 1/2 inch w. Your terrarium light requires 2 AAA batteries. (not included). This package contains plastic jar with light up lid, crystal growing powder, growing 'crystal rocks', color sticker sheet, glow-in-the-dark sticker sheet, self adhesive pearls and cabachons, wiggly eyes, plastic measuring container, pearls and gemstones, mermaid sticky putty, plastic clam shell, sticker with adhesive, purple gravel, and wooden stir stick. Recommended ages six years and up.