Strong Neodymium Disc Magnets N50, Rare Earth Magnets Heavy Duty with Double-Sided Adhesive, Black Round Circle NdFeb Magnets for Crafts, 20 x 3mm (Pack of 20): Amazon.com: Industrial & Scientific
Amazon.com: daw21onlineshop Neodymium Magnet N50 15x5x2.5mm Cuboid Block 1 Very Strong Magnets for Glass Magnetic Boards, Magnetic Boards, whiteboards, blackboards, pin Boards, refrigerators : Everything Else
CMS Magnetics® Grade N52 Super Strong Neodymium Magnet Ring OD1.26" x ID 1/2" x 3/8" - Rare Earth Magnet Ring for Classroom, Science Project and DIY Applications - One Pack: Amazon.com: Industrial