Like all capped reed instruments and all ocarinas, gemshorns too are 9-note instruments; they do not "overblow" into a second octave. With a basic scale in -c''-, the range is from -b'- to -d#''-, they are approximately 7" long. Baroque fingering, double holes for -c-c#- and -d-d#-.
A fingering chart and pouch are included in the price. "Begin with three" and "Capped Reeds Companion" are two methods and sources of music for gemshorns listed below