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They weigh the same as a set of ebony pegs. Are you sure you have the right ones....ie. "stealth"
Alumnus of Wood and Strings
I used Grover Uke tuners on mine, 18:1 ratio, very light weight, about $10 a set, and have nice unobtrusive black buttons.
Lap steels, banjos, and mando family instruments for the world!