This set of needles from addi is perfect for projects that need precision. The shorter needles make smaller circumference projects possible. Some knitters prefer the shorter needle hand feel. The sharp points allow for precise stitches, especially with lace and fine yarns. The convenient carrying case means that your needle set can travel with you, meaning you'll always have the right size needle for whatever project that you need to cast on. Including needle sizes from US 4 (3.5mm) to US10 1/2 (6.50mm). Included are several cords and a cord connector for a wide array of lengths. Also included is the key that locks and unlocks the unique click connection that is unique to addi Interchangeable Needles. Please don't hesitate to contact us with any questions.