Circular needles

I was thinking about buying a set of circular needles. On Ebay there is a set with all size needles and the length of the wires are 31 inches. Is this a good size for sweaters or would a different length be better. What else can they be used to make at that length? I’m new to knitting fancy things and would love to start knitting sweaters. Thanks,

It depends on the size sweater you would be making. You might consider a set of interchangeables…all different size needles and cords. There is a whole thread about it HERE