Spalted maple guitar top type 'B' strong figure.
For drop tops
Acer macrophyllum sourced from USA.
Photo is of a typical piece.
Our spalted maple is sourced from one of the North west USA species of maple and is closer to sycamore in density and characteristics than would be American hard rock maple from Eastern USA and Canada.
It is in the nature of spalted wood that there can be soft patches and the occasional worm hole. These issues are included in the grading process and are therefore less of an issue in the higher priced sets.