Folding Push-Pull Ink Converter – Compact Travel-Friendly Pen Converter | Folds to 33mm, Extends to 52mm | Universal Fit for Standard International Fountain Pens | Easy Twist-Pull Operation Key Features ✓ Folding push-pull design – compact 33mm closed length stores neatly inside pen barrels; extends to 52mm for full ink capacity and easy operation ✓ Universal compatibility – fits most fountain pens that accept standard international cartridges/converters (including Lumink and many other brands) ✓ Smooth twist-pull mechanism – simple, reliable operation for drawing and expelling ink; no leaks or mess ✓ Lightweight & durable – precision-engineered for long-term use; easy to clean and maintain ✓ Travel-friendly – compact folded size makes it ideal for carrying spare converters or fitting into smaller pen bodies Specification Length (closed): 33 mm (1.30") Length (open): 52 mm (2.05") Type: Push-pull (twist/pull) piston converter Compatibility: Standard international fountain pen converters Application: Ink refilling for fountain pens, travel, everyday writing What's in the Package ✔ 1× Folding push-pull ink converter