Got my first tablet a week ago (one by wacom medium) and my first nib already looks like this. Is this normal for a week's use? I've been using it for 6-7 hours a day tbf but it only came with 4 extra nibs in the box and at this rate I'll be out in a month.

Also, are these chink replacements fine to use?
https://www.temu.com/gr-en/pack-of-10--digital-pen-replacement-tips-for-one-by--bamboo---pro--series-compatible-with-cte-mte-ctl-cth-models--durable-smooth-black-g-601100653137094.html
Or am I gonna drill a hole in my tablet?