ChiaoGoo stainless steel double pointed needles are made of surgical stainless steel. They are machine-precisioned with perfectly tapered tips. They have a smooth satin-sheen finish with the needle size permanently laser imprinted on each needle.
You can find out more about them here
This [S] [L] Tools Kit is to be used with the TWIST Interchangeable system.
You can find out more about them here