Note: Please allow 2-4 weeks for delivery.

A full set of 24 Premium Sipario (aka Salvi or Aquila Corde) SilkGut harp strings.
These are superior strings (much better than your standard nylon) with long sustain and a very good overall feel, tension and tension distribution. 

The Harp·E was engineered for those strings, so using any other (nylon, metal etc.) might result in difficulties for tuning and regulating.

Note that when you first buy the Harp, it comes with a full set of strings already. This is only for spare strings!