i’m not an expert, but with my yamaha 4c mouthpiece i couldn’t get any joy out of the vandoren reeds, and i bought them by the box. Then i changed mouthpieces to a Kali Rubber 8, gave the vandorens another try and the java green was fantastic even though it was a 1.5, and the normal vandoren 1.5 reeds were ok as well. So it is strange, for me i get the impression that some mouthpieces were designed around specific reeds?