Brzhair U-tip hair extensions are hair extensions that are pre tipped with keratin and are applied to the client by use of a hot hair extension iron. This type of hair extension is also called “Fusion.” The shape of the tip can vary from u-tip to flat tip, depending on the brand. The keratin tip may have to be trimmed to remove the excess keratin. The heat from a hair extension iron will not damage the hair, it's less hot than a standard curling or flat iron and the hair extension iron only touches the hair for a few seconds. Brazilian Virgin carries both . We produce one of the finest fusion hair extension on the market just ask our customers . rather its body wave, striaight, or natural wave. you will be the Queen you were meant to be. :)