Product Description: Ferro fluids are liquids infused or made with nano-scaled particles that becomes magnetised. This venom ferrofluid is an addictive and intriguing desktop accessory, the perfect gift for a science lover. This gift comes with two magnets. Be amazed as the black liquid dances, shifts and morphs creating unique and hypnotising shapes. Bottle size: 50ml of which 1 is ferrofluid. 2 x Neodymium magnets with handles.