威廉索斯韦尔黑钻系列M122采用德国进口STRUNZ实木音板，选用含有树脂的糖松作为肋木，肋木末端采用手工嵌入内壳，确保提供强大而持久的支撑。齐备德国进口FFW榔头和英国特制Murdoch榔头，德国雷诺式击弦机，德国原裝进口的Roslau琴弦，其高音区采用高耐力钢材制成；低音区钢材为芯，缠以纯实心铜，增加细调微调的功能，可以满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.