Neodymium Ring nickel plated Magnets are available in a number of different grades, 
and the size can be manufactured from 2mm to 220mm, maximum thickness 50mm.

Applications for Neodymium magnets are widely used in industrial, Medical and modern technology. 

Ring Magnets are magnets that are round in shape with a hole. 

This ring magnet is dangerous and not suitable for children or any kind of "fun use", 

as it can seriously pinch fingers or lead to any number of injuries.