¿A qué clase de instrumentos pertenece? 5th grade homework Help

Question

That is the question. The answer, he has to fill in the blank. So far, the answer is: Es un instrumento de___|\___|\___|.
We can't answer the homework question, therefore we don't know what to put as the answer. Thank you!
Did I post this correctly'

Answer 1

No. No photo

Answer 2

The question before this one is about a guitar. So, would the answer be String Instrument? How do you write it in Spanish? Thank you so much!

Answer 3

instrumento de cuerda
Thanks!!!!