These are very basic one-piece cast aluminum seatposts. They will do the job, but probably won't win any beauty contests. They have looks only their Mother could love, shall we say.... Fluted shaft, "French" micro-adjustable pivoting two-bolt adjustment system, approx. 210 mm long. Supply is rather limited on these. For a vintage French bike - or any bike that uses these sizes, this is one of the best posts we can find for the money (that isn't made in China!). You can also use shims with these to adapt them to lots of other sizes. No returns on these. These are not the classic badged or decaled steel Simplex posts. Your actual mileage may vary. Objects in mirror are closer than they appear. Kids, don't try this at home. Only a few sizes remain, as listed below.