Demonstrator - Transparent and clean, perfect for ink lovers Choose from fine or medium nib sizes for the perfect writing feel. With a smooth snap-fit cap and convenient cartridge/converter filling system, the Triad is engineered for effortless use and everyday reliability. Specifications: Fountain pen material: ABS plastic Nib: Silver plate No.5 stainless steel Filling system: cartridge/converter (sold separately) Fountain pen length, closed: 130 mm Fountain pen diameter, barrel: 17 mm Fountain pen weight (without ink): 15 g Gift boxed