What Is A One Piece Hair Extension? One piece hair extensions quickest and easiest extensions to be applied DAISY WAND WAVE ONE PIECE HAIR EXTENSION UNice Hair Mongolian Natural Wave Human Hair Extensions 1 3 Bundles Stunning One Piece Hair Extensions at geehair.com. The 20 Wand Wave One Piece quickly creates a salon worthy style. It is styled with loose waves that gently fall to a 20" length to create a 'just stepped out of the salon' look. It can be easily attached to boost the length and volume of your hair instantly. Please note that the hair cant be restyled; the heat resistant element maintains the current style. There are no return on hair extensions.