All of my clip on earrings are 12mm (about 1/2inch) and are hypoallergenic stainless steel forms. The image below shows the backside

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Leopard US$8.45
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Rainbow Leopard US$8.45
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Spring bird US$8.45
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Beautiful Rose US$8.45
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Blue Tile US$8.45
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Turtles US$8.45
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Froggy US$8.45
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Mermaid Scales US$8.45
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Woodpecker US$8.45