These cables will fit any needle in the knitpro range. The size is measured from tip to tip after the needles have been added. If you buy the short tips, then the overall length will be 10cm less. Except the 40 cable will measure 40 cm tip to tip with a short tip needle attached.
Each pack of cables comes with 2 end caps and a tightening key.
For Tunisian hooks, remember the cable size on the package is not the actual length of the cable itself but rather it refers to the finished size of the cable once you have attached the knitting needles to it. So allow the cables to be about 23 cm shorter than the packet says.