I really like this product and I also added the LED light and extra magnet. It's still pretty fun to mess with even after the initial wow factor wears off. I did see the warning about not leaving the magnet on the glass to avoid staining, but the product seems to have an issue where it does have some slight staining in random places at the top. This is the only reason I didn't give 5 stars.
Also, be careful if you get 2 magnets... they are so strong, when they get megnetically drawn together, sometimes your skin can get pinched.
Great seller, cool display. Looks like maybe a water based ferrofluid in a clear oil so they don’t mix. Permanent magnet in the bottom makes it spiky but it comes with another magnet you can hold up to the glass and pull the ferrofluid away from the bottom
Great customer service. Fun product for kids. Nice as a desk top item in an office.;)
Keeps it at work with him and enjoys it a lot great work
SPIKE ferrofluid display (Black ferrofluid)