What is a cannula piercing needle used for?

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What is a cannula piercing needle used for?Cannula vs. NeedlesCannulaNeedlePrimarily used in European piercings (most notably around the U.K.)Primarily used with American piercingsShort bevel, only sharp on 1 edgeLong bevel, sharp on all 3 axesShallow penetration of the skinDeep penetration of the skin