The Tressa attachment 7x fast braids (often associated with high-value "7X" multi-packs from brands like X-Pression or Darling) is a pre-stretched, pre-combed braiding hair designed to drastically reduce the time spent on installation. These multi-packs are popular for being a "one-pack solution," providing enough volume for a full head of braids without needing to buy multiple individual bundles.