So many needle felters have asked me about reverse (inverted) needles and exactly what do they do. Reverse needles do the complete opposite of regular felting needles. Instead of pushing the fibers down and tangling the fiber these needles pull the fibers up. The most important thing to remember is whatever color you have under your top color will be pulled through. This will create a fuzzy look. The reverse needle is wonderful for creating shading as well by simply needle felting colors on top of each other and then pulling the colors through with the reverse needles.
Dream Felt has Reverse Needles available is size 38T and 40T.