Giant refill with Viscoglide technology for smooth and gliding writing. ISO format G2. Extra Broad line width (XB). Waterproof according to ink standard ISO 12757-2. The wear-resistant stainless steel tip guarantees that the large ink supply can be fully used and does not smear. The ink dries quickly - even on smooth paper - and is smudge proof when highlighting it later on. Fits all Schneider Plug+Play ballpoint pens as well as many other pen types. Sold as a pack of 10 black ink refills.