Many brass instrument players pay attention in terms of design and specification of mouthpiece, such as inner diameter and throat size. How about weight? I know there are mouthpieces featuring "Light Weight" and "Heavy Weight"; however, I have rarely seen weights in digital figures. I have to admit weight variance or tolerance through production.
I found an analogue scale at my place and measured my tuba mouthpieces. Please take a look the following table. (The analogue scale is not as accurate as digital scale.)