Not the Xbox One analog sticks.
Aluminum.
be careful to unplug the ribbon cables carefully, and from the start to eleminate risk of unplugging the sides that are covered.
While taking apart the controller, press the L2 and R2 buttons to make the underside shell come off a little easier.
unplug the battery, and take it out, there is one screw holding the rest of the controller together(5 screws in total after the 4 shell screws).
The logic board should only be wiggled out after you have unplugged the ribbon cable I warned you about.
Now, you have access to the analog thumb sticks.
They are not glued, but are on pretty tight, so use reasonable force, with a little wiggle.
place the desired thumb sticks on, and put back together.
If you mess something up, it can likely be fixed, but remember: There are no repair/replacement parts to buy online if you actually break something.
If you have not taken any electronics apart in the past, this is a bit close to intermediate levels, but is doable. Just be warned, it aynt all that easy.
Clips hold the controller together, so after you unscrew the 4 screws, you will need to push/pull the shells apart, starting on the handle side.
lol they like making it interesting don't they, sounds a fair bit more difficult than taking a 360 pad apart.
But that's cool, I love taking electronics apart and putting them back together (mostly the right way too!). When the sticks on my DS4 go, I'll definitely be getting some o those aluminium bad boys.