These work with the TWIST Red Lace Interchangeable Sets. The small cables work with 2.5mm - 5mm tips. 

The size of the cable coordinates with the diameter of the needle tips.

S- small cables are used with : 2.5mm-5mm tips

M-mini cables are used with : 1.5mm-2.5mm tips

L -large cables are used with : 5.5mm-10mm tips

Please note: the 20cm cable makes a 40cm circular with the 4 inch tips.  The cable will be too small with the 5 inch tips.