The 38 gauge star felting needle has 4 working edges, so making it slightly faster to work with. A finer alternative to the 36 gauge and can be an advantage when working with finer fibres. This needle makes a smaller hole and felts the fibres faster. This needle is great for finer detail like eyes and finishing touches.
Needle felting is a process of using barbed needles to interlock wool fibres to form a more condensed and tight material. Wool fibers have scales which when needled against each other catch and lock into place to create this denser material called felt. Felting needles are used to entangle the fibres. As the felting needle is moved up and down, the barbs on the needles catch the scales of the wool and entangle them into place.
There are many sizes of needles that are available to use for needle felting. The most popular are the 36, 38 and 40 triangular and star sided needles. The 36 gauge triangular pointed needle is the most commonly used for course fibre and faster felting. It does leave larger holes so it is not a good finishing needle. The 38 gauge triangular needle is great as an all purpose felting needle and a must have in your collection. The 40 gauge triangular needle is used for fine detail and a finishing needle on faces and detailed felted pieces. The star shaped needles have one extra side on them and work great and a bit faster because of the one extra side. I prefer the star sided needles myself. The higher the gauge #, the finer the needle. I recommend using a core wool for needle felting. It is cheaper and denser so it will needle felt faster and you do not see it so it does not matter what it looks like. Nickelbee Art Studio and Supplies sells many more types of Felting Needles.