Opera is one of Visconti's most intensely iconic collections. Its squared circle form, combining a square and a circle, is not just the perfect ergonomic shape for the writing implement. Technical details: Writing type: Fountain pen Nib: Tubular nib Material: Anodised avional Metallic parts: Palladium-plated Filling system: FP converter/cartridges My System: Yes Model: 738ST00A59F