Ballpoint pen refill express 735. Product can be used with: Fits all Schneider Ballpoint Pen models and gel pens with plug + play, as well as many pens with G2 Universal fit system. Cartridge Type: International large-capacity refill in the G2 format. Cartridge Size: M, Blue, Permanent ink. Refill type in accordance with ISO standard: ISO 12757-2 G2. Barrel Material: Metal refill. Length: 98 mm The hard-wearing stainless steel tip guarantees Large paste contains complete and smudge-free use.