The extraordinary Penlux Delgado Gladius collection belongs to a world-class collector who possesses a deep passion for unique material and nib. It is a newest edition of Delgado collection. The nib of Gladius collection is all hand grind by world renowned nib master Mr. Nagahara who had been a nib specialist for decades. The Gladius Blue Grotto is using multi-compressed (Plaques) PMMA which is developed by Penlux. The material is combined multiple layers of PMMA. Each layer must be mirror polished, then high pressure with glued. All pens are matching with Trim is IP bronze plated and with a special engraving pattern of nib. Each pen comes with a certificate which is signed by the owner of Penlux Mr. Hsu and nib master Mr. Nagahara to prove the highest quality manufacturing attention and authenticity of product.