Prym Knitter’s kit . The knitters’ kit contains two auxiliary needles that are 2.5 mm and 4 mm thick, two wool needles in gauges 1 and 3, a rotally, and a stitch holder. The auxiliary needles and stitch holder are made of grey-coated aluminium, the wool needles are made of steel, and the rotally is made of plastic. You will be perfectly-equipped for most knitting challenges with this set.