Magic rocks instant crystal growing kit. Create a brilliant underwater garden. Rocks grow to different heights up to 4". Includes 1 space background print, 1 sticker sheet, 1 tank and detailed instructions.  Adult supervision required. Intended for children ages 10 years and older. # Pieces In Set: 4 Learning Skill: Science Recommended Ages: 10 Years And Up Measurements: 11 Width/Inches, 10 Length/Inches, 2 Height/Inches Assembly: Assembly Required Base Material: 100% Plastic Care: Wipe Clean Country of Origin: Imported p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} WARNING: CHOKING HAZARD – small parts. Not for children under 3 years.