Our company has been specializing in producing NdFeB magnet for 12 years, We developed many permanent magnet applications, we have experience on designing magnetic flux and assembling complicated magnetic construction. Our company ordered special SUS304, SUS316, stainless tube as outside shell and select quality permanent magnet to combine into strong magnet bar, we have special equipment to process them, we can guarantee the top flux 1.25T of bar magnet. And they can be used in 350 Degree C (top temperature). The life can be 5-8 years. 
We delivered bar magnet with Eco-friendly packaging material, we deliver the goods promptly. And our price of grate magnet bar will be competitive all over the world. 
We can provide round filter magnetic bar of diameter of 0.5", 0.75", 0.875", 1", 1.25", 1.5", 1.75", 2", 3", 4", the length cab be supplied on request. Square filter magnetic bar can be processed as per your design.