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No. 02 Coil Concealed Closed End. Automatic Lock Slider O-Type Drop Plastic Topstop CONCEAL® is an invisible zipper where you can not see the element. It does not disturb the garments design so it is best suited for dresses and skirts. Also, the CONCEAL® open-end zipper can also hide the open parts so it is recommended for the jacket where the open-parts need to be hidden.