The oxide is harmless

50ml glass bottle

a process resulting in various unique color combinations

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Pilot Metropolitan Fountain Pen - Silver Nib Size:Medium The oxide is harmlessPilot Metropolitan Fountain Pen From a 100 year heritage of crafting the world's finest pens comes the Pilot MR Metropolitan Collection. These pens, with their fluid lines and elegant finishes are modern classics. Featuring a stylish, premium matte finish over a brass barrel, MR Metropolitan is available in three classic colors with stainless steel accents and nibs. Elegantly presented in a black gift box and available in a variety of points.