Amazon.com: Master Magnetics Ceramic Round Base Magnet with Bolt and Nuts - 2.04" Diameter, 1.25" Height, 35 Pound Pull, Nickle Plated, Pack of 5, RB50B3NX5 : Industrial & Scientific
Neodymium Round Base Cup Magnets with Heavy Duty Countersunk Hole, 60 lbs Strong Rare Earth Magnets with Screws for Refrigerator, Office, DIY, Craft, Dia-1 Inch, Pack of 12: Amazon.com: Industrial & Scientific
DS18 PRO-CF6.4NR 6.5" Mid-Bass Loudspeaker with Water Resistant Carbon Fiber Cone And Neodymium Rings Magnet 500 Watts 4-Ohm.