A double stack magnum is a needle arrangement that consists of a bottom layer of needles lined up tightly in a row with a second stack of tightly lined needles on top of the first. The layers have different numbers of needles in them. Common double stack magnum sizes are 5, 7, 9, 11, and 15. The bottom layer has one more needle than the top, so a 5 mag would have three needles with 2 laying on top.
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