Features GreenLine instruments are made with wood that is recovered and recycled in the manufacturing process The resulting wood composition is resistant to temperature and humidity changes. 3 year limited warranty Description Product Description Key of C. Full conservatory system, 3rd octave key, silver-plated, and adjustable thumb rest. Includes deluxe leather pochette case.GreenLine instruments are made with wood that is recovered and recycled in the manufacturing process using a proprietary technology developed by Buffet. The resulting wood composition is resistant to temperature and humidity changes.