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A comment often heard on saxophone forums is that metal resonators make the keys heavier, or they collectively make the sax heavier to carry. One would think that metal reso's weigh more than plastic ones. It's just common sense, isn't it. Here is what my measurements found. I just weighed a plastic and metal resonator the same 28mm diameter, the plastic with its brass plug and the metal with its metal rivet. The metal weighted 1.5 grams and the plastic weighed 1 gram. That is a .5 gram difference. If you want to know what .5 gram weighs, put a 3"x3" post-it note in your hand. That is .5 grams.
A 28mm reso is about the average size many are smaller and some are larger. With high F# the saxophone has 23 keys. Assuming they all have resonators, the metal resonators would add approximately 11.5 grams to the weight of the saxophone over all plastic ones which is roughly .4 ounces. Obviously if one installs the thicker Maestro type metal resonators there will be more of a difference, but still less than one might imagine.
A 28mm reso is about the average size many are smaller and some are larger. With high F# the saxophone has 23 keys. Assuming they all have resonators, the metal resonators would add approximately 11.5 grams to the weight of the saxophone over all plastic ones which is roughly .4 ounces. Obviously if one installs the thicker Maestro type metal resonators there will be more of a difference, but still less than one might imagine.