2 of 5 (13cm) Needle Tips for ChiaoGoo Twist Interchangeable Set, Size US 6 (4mm);ChiaoGoo Red Lace circulars are made of high grade stainless steel;Each item is light weight and durable, precisely machined with satin finish with perfectly tapered tips;Size is permanently laser etched on each item for added convenience and easy storage;ChiaoGoo products are mostly made in Hangzhou, China, distributed from Troy, MI (USA) and adheres to the latest environment-friendly manufacturing processes; most products are 100% recyclable