Pot magnet – ferrite – white coating / countersunk
Magnetic Bar Building Toy Hollow Iron Ball 3.5mm Hollow Synthetic Iron Ball Magnetic Bar Accessories Magnetic Balls and Rods Set Ferrit Magnet Ball Rod Toys - China Magnetic Bar and Magnetic Balls
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Hard Ferrite magnets - magnet.works
Ferrite (Ceramic) Ring Magnet | Eclipse Magnetics
Powerful and Industrial thin ferrite magnet - Alibaba.com
Custom Strong Thin Block Ferrit Magnet Bar Ferrite Magnet - China Ferrite Magnet, Permanent Ferrite Magnet | Made-in-China.com