If it's a DMF you will see it being two pieces. You can take the center piece and try to move it with the outer piece stationary. If it moves easily it's probably wore out and it may have some springs and plastic pieces missing. Some people have run them too long and have had the springs jump out between the flywheel and the block and tear the block up some.

If you have a aftermarket setup, and want to replace some of the pieces, make sure you look at the maker of the clutch and order the correct pieces. The factory stuff won't work with the aftermarket setup.