The El Wire I used: https://www.amazon.com/dp/B005Q5WVBU/ref=cm_sw_r_other_apa_i_5CTYDbD9JHQQ7

String: https://www.amazon.com/dp/B000IGEBSS/ref=cm_sw_r_other_apa_i_eFTYDb58P80HW

The El Wire worked pretty well, but when I put it on flashing they flashed at different speeds. Though it did have a neat effect.

Good luck!