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Master Magnetics 07239 Original Cast Alnico 5 Cow Magnet, 0.50" Diameter, 3" Length, Silver (Pack of 2): Toy Playboards: Amazon.com: Industrial & Scientific
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Facts - Curious & Interesting on Twitter: "Cows are fed magnets that stay in their stomach for life to collect metal objects like nails or barbed wire that the cow will occasionally
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Amazon.com: Master Magnetics COW-RUM5CX12 Cow Magnet, Ultimate Heavy Duty Ru-Master 5, Steel Ring and Ferrite, 0.75" Diameter, 3.375" Length, Black and Silver (Pack of 12) : Industrial & Scientific
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