This Sentryman Black resin rollerball pen is engineered in brass coated in a black resin, for a smooth masculine finish. It features a bombe clip and AD hallmark logo on the cap top. 這款 Sentryman 黑色樹脂走珠筆採用黃銅材質，外覆黑色樹脂，呈現光滑陽剛的質感。筆夾呈弧形，筆蓋上方飾有 AD 標誌。
