Glass-buttoned early 56-key Edeophone for sale in Buy & Sell Posted October 8, 2022 · Edited October 8, 2022 by david robertson The glass rod is set into a brass ferrule, and the combination is much sturdier than Wheatstone's wooden-cored buttons. As for the weight, Robert, I suppose they may be marginally heavier than the usual Edeophone hollow metal buttons. Out of idle curiosity, I weighed a bunch of metal ones, which come in at 1.36g each, or 76.2g for a set of 56. If we assume the glass buttons are 10% heavier, the difference is less than the weight of an English pound coin! The whole instrument, by the way, enters the ring at 1.27kg. For comparison purposes, my Jeffries, with 17 fewer buttons, weighs in at just over 1.5kg. No wonder I feel tired all the time!