The CX has inset wooden tonehole chimneys, not plastic ones. The YCL62, 62II, 62IICX and YCLCX (and A clarinets being the YCL65, 65II, 65IICX and CXA) are the entry level pro models as sold in Europe the YCL72 is the US equivalent. The YCL82, 82II, 82IICS and CS (and A clarinets being the YCL85, 85II, 85IICS and CS) were their Custom models.