This ball magnet is a grade N35 neo magnet. It has a large outside diameter of 10 mm. This auction is for a pack of 8 magnets, but you can order multiple quantities.

Neo magnets are also called Neodymium magnets, Rare Earth magnets, Nd-Fe-B magnets, Neodymium Iron Boron magnets or NIB magnets. They are a permanent magnet made from an alloy of neodymium, iron and boron. Neodymium magnets have grades from N35 to N52 and are the strongest and cost effective permenant magnets manufactured.

The energy product is specified in units of Gauss Oersted. One MGOe is 1,000,000 Gauss Oersted. A grade N35 has a Maximum Energy Product of 35 MGOe. The higher the grade the stronger the magnet.

CAUTION. If swallowed, neodymium magnets can be lethal if 2 magnets join up. Strong magnetic fields can disrupt medical devices such as pacemakers. These magnets can severely pinch skin or crush fingers. Avoid use around electrical and magnetic devices such as TVs, computers, tapes, credit cards etc.