Originally Posted by Terasec

as you guessed
the inserts are inserted in the arrow shafts and allow for tips like broadheads and field points to just be screwed in
you will need to buy both a set of broadheads, and field tips for practicing
most shops and sports stores including walmart sell broadheads and field tips,
field tips for practicing are cheap, broadheads prices will vary, from like $10/ 3 pack to +$30/ 3 pack
weight of your tips will be important,
whether your using 100 grain or 125 grain points 2 most common weights