(STATS) - The pro days that will take place over the next month provide an important opportunity for NFL prospects who seek to make a final impression before the draft April 25-27.

They're especially key for FCS players who always feel they have to do more than their FBS counterparts.

On pro day, a prospect goes through NFL Combine-type measurements and testing, usually at a campus site. Many will get drafted, even more will turn heads to gain an undrafted free agent contract or rookie camp invite.