The G series Custom Clarinets are the culmination of years of development and feature a new alternate Ab/Eb lever mechanism. The newest in the line of G Series Custom Clarinets are the "L" models which feature a low E/F pitch correction key.
The CSG is an entirely new kind of clarinet. Yamaha reanalyzed and reevaluated literally every single design specification until they had created an instrument that harks back to the tonal purity and natural resonance of aged grenadilla wood. There's less metal used on the CSG, so the whole body reverberates with sound, while the new bore, barrel, and bell shapes offer a tone of breathtaking richness and depth. The sound is warm yet has a clear focused center surrounded by a wealth of overtones, resulting in extraordinary beauty and expressivity. And the tone projects with remarkable ease in even the largest concert halls. There's never been a clarinet like this before.