Our largest panpipe has 15 tubes, measures 8.5" x 6.5" and is in the key of "C". The lowest note is the first "G" above midle "C" on the piano. The elegant instruments are made of Pyrex glass and are decorated with a kiln-fired glass enamels and 22 k gold. Each panpipe is closed at the bottom with a permanent Pyrex glass seal instead of sliding corks. This makes the tuning permanent and also looks better. The panpipe tubes are assembled using clear epoxy resin for a durable bond.The panpipe is gift boxed and includes a "How to Play the Panpipes" booklet.