Amazon.co.jp: Magnets, Super Strong Neodymium Magnet, Small Round Disc Magnet, 2/5/10/20/50/100 PCS, 30x10x3 Blocks, NDFEB Neodymium Magnet, 1.2 x 0.4 x 0.1 inches (30 x 10 x 3 mm), N35 Super Strong
N42 Neodymium Disc Magnet - 12mm dia x 6mm thick - 9.48lbs Pull
20mm x 10mm Neodymium Disc Magnet N42 (12.21KG Pull) - Magnet Store