A major innovation in harpsichord construction took place in Flanders some time around 1580 with the work of Hans Ruckers and his descendants, including Ioannes Couchet. The Ruckers harpsichord was more solidly constructed than the Italian. Because the Ruckers workshop used iron strings for the treble, as a result the scaling (the length of the vibrating part of the string for a given pitch) was longer, (always with the basic two sets of strings; one 8-foot and a 4-foot), with greater string tension, and a heavier case, as well as a very slender and responsive spruce soundboard, the tone was more sustaining than the Italian harpsichords', and was widely emulated by harpsichord builders in most other nations.