Everything being said is concerning gold 150 Ohm version of st10s. I happened to obtain cheaply gold version of Smabat st10s. at first glance i was confused because gold color was almost transparent, and thought that seller messed up and sent me silver version, but after checking resistance with multi-meter it showed honest 150 Ohm. First impression that they are almost weightless, in my memory first version felt was quite hefty in ear, but in my opinion less weight - better. Another thing - earbuds had unpleasant sound of wobbling inside, maybe...