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Ring Magnets - Neodymium Magnets - SuperMagnetMan,

Master Magnetics Ceramic Block Magnet,

Amazon.com: DS18 6XL650N-4 PRO 6.5,

DIYMAG Black Strong Neodymium Rectangular Pot Magnets with,

Airgas - LINED032888 - 1/8,

Amazon.com : Canon MR-14EX II Macro Ring Lite : Electronics,

ARO, Universal, DIN 43650 Form B, Solenoid Coil - 4HN40,

Airgas - LINED012386 - 5/64,

Amazon.com: DS18 6XL650N-4 PRO 6.5