D’Addario Flamenco sets are constructed using a new variation of our exclusive multifilament stranded core material, which dramatically improves the life and tuning consistency of the wound strings when compared to traditional nylon cores.  These sets were created and tested with artists worldwide to deliver a flexible feel while still maintaining a quick attack response that is essential for flamenco players.

EJ25C - Silverplated Wound basses, Clear Nylon trebles

These sets are also available black nylon trebles, providing tone and appearance for more
progressive players.

https://www.stringsdirect.co.uk/products/8561-d_addario_composite_flamenco_clear_nylon_classical_strings_ej25b