If you are wearing out your plastic pen nibs too quickly, you might be considering a metal nib. Metal nibs in theory never wear out.
Are metal nibs safe for your pen tablet?
(part 1) (https://youtu.be/m0kYXa7Y4a8)
(part 2) (https://youtu.be/aByhTQOcIeM)
(part 3) (https://youtu.be/mU8MsD-DY0w)
(part 4) (https://youtu.be/c1dQj4q5lDk)
(part 5) (https://youtu.be/WvmMHzZoclg)
I DO NOT recommend using a metal nib
ferrite core damage - Some people report that the metal nibs can cause the pen's ferrite core to easily break. When the ferrite core breaks it cannot be replaced. You have to buy a new pen. I did not experience damage to the ferrite core even after I dropped my KP-504E pen repeatedly with the metal nib hitting the floor directly. However, I don't doubt that others have experienced real damage.
pressure sensor damage - I personally experienced that a metal nib cause a permanent increase in the initial activation force of my Wacom Pro Pen 2. This means the pen become less sensitive and going back plastic nib does not restore a low initial activation force. See this video for more details (https://youtu.be/WvmMHzZoclg).
I DO NOT recommend using a metal nib directly against the glass of a pen display
I haven't tried it with a pen display and I right now would not recommend someone doing doing that. I do believe there's a chance it can damage the screen. I've even seen people with plastic nibs damage the screen of their pen display.
If someone is going to do use a metal nib with a pen display, I would recommend using a protective sheet. See this doc protective sheets.
You may find different options for nibs, here several I know of.
For Wacom Pro Pen 2
TWITE Graphics (https://hitomins.tumblr.com/products_sus_English#b)
I purchased from (https://alice-books.com/item/show/1113-4) but you may find other sources.
This is the nib I use for the "Are metal nibs safe" videos
REEYEAR ( https://a.co/d/8H6lqGq)
TWITE Hybrid metal/plastix nib (https://hitomins.tumblr.com/products_hybrid)
For Wacom CTL-672,CTL-671,CTL-471, CTL-472
REEYEAR metal nibs (https://www.amazon.com/dp/B0B2PGDF6S)
https://www.reddit.com/r/wacom/comments/740ktd/metal_nibs_where_do_you_purchase_them/ -
https://www.reddit.com/r/wacom/comments/ts2ted/titanium_alloy_pen_nib/ -
https://www.reddit.com/r/wacom/comments/tklhcn/stainless_steel_nib_finally_came_time_to_art/ -
https://www.reddit.com/r/wacom/comments/t7lraf/better_nibs_for_ctl472/ -
https://www.reddit.com/r/wacom/comments/gyo4ug/pro_pen_2_stainless_steel_nib/ -
https://www.reddit.com/r/wacom/comments/kyl5lj/but_seriously_why_are_all_my_nibs_sharpened_to/ -