With the keychain clip you don’t have to worry like with other tweezers (chances of friction.)
In case you find your tweezer-tip, blunt you could sharpen it from time to time at a knife store or in the comfort of your home with sand paper.
Don’t forget to clean your tweezers, especially if you’ve bled. Take a cotton ball and dip it in alcohol and wipe out the tips thoroughly. You can then soak the tweezers in a hot water for around 5-7 minutes.