I have 4 hp 80’s made by PST (no longer avail by that company) and they are great. They are smaller in dia, shorter and there is not that much wieght difference due to the smaller size.I just adjust my wieghts accordingly. Steels if taken care of will also last longer than al. Most of my dive have been in salt water. I have a grandduaghter who is only 5’1" and wieghs in around 90lb and she has no problems with them at all. Actually fit her better than the al80.