Multiple sets of double-pointed knitting needles. Note: these are meant for knitting in the round, i.e. making socks or mittens with a set of 4 needles. These are not suitable for beginners just learning to knit on 2 needles unless you put something on one end to stop stitches from falling off and give a clear sense of which end is which. You can wrap coloured rubber bands around the ends to mark left and right needles though and it works fairly well, though don’t use hair elastics as they’re too slippery and slide right off.