Schneider Express 735 Medium 1.0mm Ballpoint Refill, Box of 10, Blue (7363) Universal size refill writes over 5.5 miles with a 1.0mm medium line width Box of 10 refills; blue ink; actual size: 98.1mm x 5.8mm Light resistant, waterproof and documentary according to ISO 12757-2 Wear-resistant stainless steel tip for added durability Voted the "Brand of the Century" by Deutsche Standards