*Ferrofluid is the astonishing liquid that becomes highly magnetized in the presence of a magnetic field.*This Ferrofluid in a Bottle makes a great interactive display that will look awesome on your desk or coffee table. Everyone will enjoy playing with it.Specifications : Bottle volume : 60ml; Ferrofluid volume : 1.25ml; Bottle size : approx. 9x5.2x2.8cm; Package size : approx. 16.7x8.8x4.5cm; Package weight : approx. 260g.