Magnetic Liquid Ferrofluid (30mL) + Thumb Pin Magnets 16mm (4pcs) L_50mm It has a diameter of

It has a diameter of 25mm

It is identified by the AMF Magnets part number 89104B

These Ferrite Pot magnets have a steel casing over a ferrite ring magnet with a threaded M5 hole for attachment purposes to non-magnetic surfaces  CAUTION: Do not overtighten attachment screws as this can potentially cause the magnet to become damaged or cracked

Magnetic whiteboards or metal surfaces in the office or classroom are examples of where this type of activity occurs

these N45H Neodymium Disc Magnets has incredible versatility and can be used for a large number of applications

Magnetic Liquid Ferrofluid (30mL) + Thumb Pin Magnets 16mm (4pcs) L_50mm It has a diameter ofFerrofluid is a ferrous nano particle liquid that reacts in the presence of a magnetic field. Ferrofluid is used as an excellent demonstration tool for magnetic experiments and recently it is being used in modern art and for other creative purposes. When the fluid is exposed to magnetic field the particles align magnetically with north and south poles and display amazing shapes, once the magnetic field is removed the fluid returns to its random