威廉索斯韋爾黑鉆系列M122采用德國進口STRUNZ實木音板，選用含有樹脂的糖松作為肋木，肋木末端采用手工嵌入內殼，確保提供強大而持久的支撐。齊備德國進口FFW榔頭和英國特制Murdoch榔頭，德國雷諾式擊弦機，德國原裝進口的Roslau琴弦，其高音區采用高耐力鋼材制成；低音區鋼材為芯，纏以純實心銅，增加細調微調的功能，可以滿足更高水平的演奏需求。

The William southwell black diamond series M122 is made of STRUNZ solid wood soundboard imported from Germany, with sugar pine containing resin as the rib wood. The rib wood ends are inserted into the inner shell by hand to ensure strong and lasting support. FFW hammer imported from Germany and Murdoch hammer specially made in Britain are available. German Renault type percussion machine and Roslau string imported from Germany are available. The high-tone area is made of high-endurance steel. Bass area steel as the core, wrapped with pure solid copper, add fine tuning function, can meet the higher level of performance needs.