This includes José Ramírez hard tension concert guitar strings. - Model: José Ramírez Concert Guitar Strings - String Type: G-3rd 2 strings, D-4th 3 strings - String Type: B-2nd 1 string, A-5th 3 strings E-6th 3 strings There are strings from different manufacturers. Please refer to photos 7, 8, and 9 for judgment. Thank you.