Specifications: Emulsion ballpoint pen with "Blending System" to prevent writing vibration. blen Material: Shaft with resin and rubber grip; Body size: Maximum shaft diameter 0.4 x total length 5.4 inches (11.8 x 139.0 mm); Product weight: 0.4 oz (12.3 g); Knock-type; Emulsion dye + pigment ink; Refill: NC-0.7 cores (RNC7).