Stainless steel 5″ (13 cm) lace tip interchangeable needle tips ranging in size from US #9 (5.5 mm) to US #15 (10 mm). Twist tips are made of surgical-grade, stainless steel which means there is little to no chance of allergic reaction, no corrosion, no discolouring and NO smell. The size is laser imprinted on each tip. Twist tips can be used with Spin nylon and Red cables.Works with all LARGE Twist & Spin system cables and accessories. An adapter to connect large tips to small cables is also available. For smaller sizes, check out the SMALL and MINI tips and cables.