We stock the Pony brand of metal/plastic single pointed needles. Up to size 5.5mm the needles are metal from size 6mm and bigger they are plastic. 30cm is the standard length and suitable for most knitting. For bigger wool and bigger projects 35cm can be more useful. For those of us that like knitting with one needle under our arm you will need the 40cm length. For toys, gloves and baby clothes 25cm needles are much more practical.