Super Magnets 10pcs 6mm Diameter Round Neodymium Magnets 1/1.5/2/3/4/5/6/8/10/15/20mm Thick Rare Earth Strong Crafts Permanent Magnet N35 Magnet Set (Color : 6mm x 1.5mm): Amazon.com: Industrial & Scientific
NCKPRO 5-50P/LOT Ring Ferrite Magnet 32 * 6 mm Hole 18 mm Black Round Y30 Magnet 32X6 mm with Hole 18MM 32mm x 6mm Ceramic Magnet (Color : 10PCS): Amazon.com: Industrial & Scientific
NCKPRO 6mm x 6 mm Small Round Neodymium Disc Magnets 6x6 Dia N35 Strong Rare Super Powerful Earth Magnet 6x6 mm Magnetic Stand (Color : 1000pcs): Amazon.com: Industrial & Scientific