Sinking grade, highly sought after in the market. The question is, is "sinking" in itself a separate grade? Or is it a sub-grade of a main grade? Example : Double Super non-sinking Double Super sinking. Do vendors, consumers, and the like, differentiate different grades/qualities of sinking wood? Or if it's sinking then it's sinking. Nothing more, nothing less, and the price should remain relatively linear. What's your experience in the oud world in general, and in the oud market especially?