These needles are made with high carbon steel by Groz-Beckert, a leading manufacturer of precision felting needles from Albstadt, Germany. Precision felting needles are specially made to withstand more use and have greater long term performance. The three sizes included in this package are the most popular among felting experts.THREE POPULAR SIZE NEEDLES – Included are 5 each of the three most popular size felting needles: 36 gauge star, 38 gauge star, and 40 gauge spiral/twist. Because of the high quality, these needles will outlast and outperform cheaper needles.COLOR CODED – The 36 gauge star (orange) is the largest needle and is used for quick felting, joining, or for course wool. The 38 gauge star (blue) is the medium size and is used for sculpting, details, and finer wools. The 40 gauge spiral/twist (green) is the smallest gauge and is used for fine details, fine wool, and METAL SHARPS CONTAINER – For safe storage or disposal of needles.