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Coil-in and coil-out
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On a coil zipper, the coil can lay on the inside or the outside of the zipper tape. This further categorizes this zipper type into coil-in and coil-out.
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Coil-in zippers have the coil on the inside of the zipper tape so it's not visible from the outside when worn (sometimes referred to as "reverse coil").
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Coil-out zippers have the coil on the outside of the zipper tape so it's visible from the outside when worn.
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Coil-in and coil-out sliders have different slot orientation to accommodate the side of the tape on which the coil sits.
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