TWIST Interchangeable 5” (13 cm) tips include sizes from US2 (2.75 mm) to US8 (5 mm). Mini and Complete Sets are also available, and the Complete Set goes up to size US15 (10 mm). These needles are surgical-grade, stainless steel tips. They are compatible with the red, nylon-coated, multi-strand steel cables. TWIST cables are memory free and have lifeline holes. They are user-friendly to knitters who are sensitive to nickel.