I don't sew, so I have no idea what these very unusual needles are used for. I do know they are old and were made in England. Longest 2 are 8"; longest slightly curved is 5"; smaller slightly curved is 4"; and very curved needle is 2.5". They need a bit of cleaning, but I'm sure they are sturdier than newer versions. You will be purchasing the whole lot of them - 5 needles - for one price.