Chiaogoo Red Lace interchangeable tips are made of surgical grade steel and are silky smooth when knitting. Needle sizes below fit the small cables unless marked with an asterisk (*) noting that you need to purchase the adapters to allow larger needle sizes (5.5mm / US9 and larger) work with the small cables.
I stock both large and small cables, but large cables only work with needle tips over size 5.5mm (US9).