The picture shows the Injected lace hair pieces we produce. The combination of injected skills and undetectable lace that we use allows your unit to have natural look and hair just look like coming out from the scalp without any knots. You can see how incredible natural it is ! The base ( from front to crown) has two mono layers. We knot hair on French lace (bottom layer) first and vent hair through the silk mono (top layer). This way, the hair will look to be injected, because the knots are covered by the top mono layer. It is the really invisible knots, Unbelievably natural!