200pcs 4x1mm Mini Small Circular Magnets 4mmx1mm N35 Neodymium Magnet Strong Dia 4x1mm Permanent NdFeB Magnets disc 4 * 1mm: Amazon.com: Industrial & Scientific
Metals | Free Full-Text | Recovery of Rare Earth Elements from Spent NdFeB-Magnets: Separation of Iron through Reductive Smelting of the Oxidized Material (Second Part)
Permanent Sinter Neodymium Round Magnet NdFeB Disc Magnet - China High Work Temperature, Neodymium Magnet | Made-in-China.com
Neodymium Magnets N45 Ring OD 4"x ID 2"x1/2" NdFeB Rare Earth Magnet | eBay
Pot magnet cylindrical with internal thread and fitting tolerance h6, NdFeB - SELOS - Experts on magnetics from 1991.