Hey @George1988! The S-Pen nib is more durable than ever, but if you ever do find yourself needing a replacement, please reach out over our Social Media channels or over the phone on 0333 000 0333. We would be able to get this resolved for you. 🙂
The Tab S7 S-Pen nibs are made with more durable material so you won't need to change them at all or not that often which is why these are not included in the box.
The S-Pen sold separately may be the old model, using the old nibs which is why this includes them in the package. Anyway, if anything happens to the nibs a repair set can be requested.