What are Virgin Butterfly Weft Hair Extensions? Butterfly weft extensions are the newest type of hair weft. It combines the benefits of injection tape in extensions and flat silk weft extensions. It is made by injecting hair into the PU weft. This creates a light, undetectable appearance, giving the illusion that hair grows naturally from the scalp.PU weft can be made to fit flatter against the scalp. They provide a natural and invisible look that blends seamlessly with natural hair. Detail about Virgin Butterfly Weft Hair Extensions Hair Material: 100% Virgin Hair, Real Human Hair ExtensionsMaterial Grade: 8A Brazilian Virgin HairHair Length: 16" 18" 20" 22" 24"Hair Life: 8-12 MonthsHair Weight: 50 Grams Per BundleWidth: 30cm/Bundle (About 11.8 Inch/Bundles)Specification: LENGTH TOTAL BUNDLES WEIGHT 16inches-24inches 1bundle 2bundles -50gram -100gram Usually, 150-200g is enough for a full head. If you need to add both length and volume, we recommend 200-250g