GLOW IN THE DARK: Glows in the dark for day or night play! FLOATS: This is great for the lake, beach or pool. EASY TO CLEAN: Clean by using soap and water! Durable, Non Toxic, Easy to clean; Made in USA Floats, Assorted Colors, Large - 3. 5 inch diameter To make the toy glow in the dark, expose it to bright natural or artificial light for 20 minutes and then it will glow in a dark environment such as outdoors at night or inside a dark room. As the brightness of the glow dims over time, you can put the toy under a lamp to "charge" it again.