Very strong magnet in plastic case, not printed - silver
DIYMAG 40x20mm Super Strong Neodymium Disc Magnet, Permanent Magnet Disc, The World's Strongest and Most Powerful Rare Earth Magnets - One Piece: Amazon.com: Industrial & Scientific
Blomus Velio Extra Strong Magnet & Reviews | Wayfair
Neodymium Ball Magnet (1/4 inches, Pack of 10) - ScienceKitStore.com
Cube N52 40mm Very Powerful Large Giant NdFeB Magnets - Magnets By HSMAG | Rare earth magnets, Magnets, Rare
Scientists build world's most powerful magnet
Mutuactor 2PCS Super Powerful Neodymium Round Magnet with 1/4''-20 Male Threaded Stud and Vertical Magnetic Pull-Force 150lb,Heavy Duty Round Magnets for Led Lighting,Camera,Tools,and Other Equipment - Walmart.com
Super-strong neodymium magnets crushing a man's hand - YouTube
Super Powerful Strong N52 40x20mm Rare Earth Round Ndfeb Magnet Неодимовый Магнит - Magnetic Materials - AliExpress
Very strong magnet in plastic case, not printed - orange
Strong Magnets (8mm X 0.75mm) Very Thin * 0.25kg Pull * Small Powerful Disc - China Neodymium Magnets, Rectangular Magnets | Made-in-China.com