Shafts are made of various materials from plastic to aluminum to titanium. Nylon and plastic shafts are lighter, but will break more easily than aluminum. Aluminum shafts are most popular. It should be noted that the titanium in the titanium shafts is not the same grade as you would find in a titanium piercing post.
If you group your darts tight and tear a lot of flights, you may want to consider spin shafts. If your dart is “fish-tailing” you may want to select a shorter shaft. Finding the correct shaft length for you may be a matter of trial and error
All Shafts Sold in a set of 3