sintered NdFeb magnet 

1.usage:
  It is easily fromed into various sizes and widely used in many fields such as audio instruments,meters,motors,aviation,electronics,instruments.

2.long life.
 generally,our magnets are plating NicuNi,which has the function of corrosion resistance .Base on your correct using way and correct enviroment,the magnet  has 8-10  year span life.so when you take magnets ,please put down gently and don't crash with other objects.don't put them in moisture enviroment.