Buku Tarif Kepabeanan Indonesia or BTKI is Indonesian customs tariff book. Recently some changes made to this BTKI and now HS Codes are in 8 digits.
You can searche for HS Codes or commodity descriptions in our BTKI 2017 page here: http://btki2017.zofiakreasi.com/
WARNING: Please note, for more accurate info please refer to this regulation: PMK 6/PMK.010/2017. I’m not responsible if you find any inaccurate information here. I only recompile existing source that I’ve found it online.