Amazon.com: Grade 8 Ceramic Ring Donut Magnet for Crafts,OD 60 mm x ID 32mm x 15 mm,Ferrite Ring Magnet with Hole for Hobbies,Science Projects,School,DIY(2 Pack) : Industrial & Scientific
Amazon.com: THCMagorilla Strong Neodymium Magnets, Rare Earth Magnets for Crafts, Heavy Duty Magnets, Round Magnets, Small Magnets, 0.79 x 0.12 Inch, 16 PCS : Industrial & Scientific
Radial Ring Magnets - Uni Pole Magnetization Neodymium N40 Ring Magnets Unipolar Diametrically Magnetized Od 21X Id 15X 15mm: Amazon.com: Industrial & Scientific
MUTUACTOR 2PACK Powerful Rare Earth Neodymium Cup Magnet with M8 Male Threaded Stud,Heavy Duty Magnetic Mounting for Safty Camera, Lighting,Tools and Other Brackets: Amazon.com: Industrial & Scientific