Science Kit: It's a good gift for teens to do some science experiments, fun but not boring as normal experiments. : The best relaxing educational toy for all ages. Your best adorable gift choice. Item Name: Ferrofluid Magnetic Display Colour: white Material: plastic Size: 3x3x10cm Note: Do not open the bottle, gently place it for it's fragile goods. When not in use, do not attach the magnet to the magnetic fluid display bottle for a long time. It's normal if there is little magnetic fluid sticking to bottom, please shake the display bottle before use. The bottle of liquid is not eatable, the magnet can not be placed in the mouth or nose, if you swallow it accidentally, please for help immediately. Do not open the black cap as it is sealed tightly for or you will get stained by the ferrofluid liquid. Please do not leave the magnets on the bottle for over 2 mins even if you don't want to . It will stain the bottle by the ferrofluid. The ferrofluid can't stand low (below 0 celsius) and high temperature (above 48 celsius) or it will be broken easily. Package Contents: 1 * magnetic fluid display bottle 2 * magnetic handles with magnetic 2 * powerful magnets 1 * English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.