ChiaoGoo needles are made of stainless steel (surgical steel). They are needles with a perfectly smooth cable (stainless steel cable with nylon coating). All TWIST series needles and cords have laser engraved dimensions. 

Needle size division (only cord and needles of the same size can be connected, or an adapter/converter must be used). 

M – MINI – needle sizes 1.5mm – 2.5mm (for 5 cm, 8 cm, 10 cm, 13 cm needles). 

S – SMALL – needle sizes 2.75mm – 5.0mm (for 10 cm and 13 cm needles). 

L – LARGE – needle sizes 5.5mm – 10.0mm (for 10 cm and 13 cm needles)