Extra Fine 42 Gauge Triangular fine 42 Barbs on 3 sides. Ax extra fine needle . Use it for the final stages of sculpting where you want to smooth and finish the surface Fine 40 Gauge Triangular fine 40 Barbs on 3 sides. A fine needle for detail work and getting a neat surface. Best not to use it when working with coarse fibres or for rough sculpting/bulk work. Use in later Stages of sculpting where you want to start smoothing and finishing the surface. Medium 38 Triangular Medium 36 Gauge Barbs on three sides. A great general needle for the middle stages of sculting your project. Coarse 36 Triangular Medium 32 Gauge Barbs on 3 sides. This is a sturdy needle and used for the beginning stages of felting. It helps the shaping go faster Free Downloads: Learn to Needle Felt Learn to Felt - Wet Felting Learn to Felt - Nuno Felting