- graphite bridge saddles
- graphite nut
The bridge saddles will reduce the number of strings you break and help the sustain the nut will also help with sustain and should help your tuning.
Having said that, it's an $80 guitar. It's not a Fender. How much money are you prepared to spend on it to still not have a Fender?
Not that it matters in the end if you get a guitar that you're comfortable with and plays well.
Good luck.