Samsung Galaxy Note 4 User Manual page 37

Configure S Pen Settings
For information on configuring S Pen settings,
including options for sounds and for tracking S Pen
when it's not stored in your device, see S Pen.
Replace the S Pen Tip
You can replace the tip of the S Pen. To replace the
tip:
1. Use the tweezers to pull out the S Pen tip (1).
2. Insert the new pen tip on the top of the S Pen and
press until it clicks in place (2).
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Know Your Device S Pen