What a Bow Peep Sight is For

What is a peep sight for?  Why do some models have a tube on them?  These are questions I hope to answer in this article.

1.What is a peep sight for?  Do I need one?
A peep sight acts like a rear sight of a bow.  If you can't see through it, you should know that your stance is wrong.  It makes sure that you come back to the same anchor point every time you draw the bow.  So, you don't need a peep sight, but it would be pretty good to have one.

2.What is the tubing attached to the peep sight on some models?
The tubing is to keep the peep sight from moving or twisting while it's in the string.  So, it is pretty much there on some models for an unstable string that could cause the peep sight to get out of alignment.