Pilot RFNS-GG-F-L 0.7 mm Fine Tip Ballpoint Retractable Refill comes with a tungsten-carbide tip. It has reliable retractable mechanism means that youre only ever one click away from being ready to write and the rubber grip means you can write in comfort. The tungsten-carbide tip is one of the toughest around, delivering the waterproof oil-based ink. Compatible with BP-145, Rexgrip Retractable, B2P Grip, Feed GP4, Feed GP3, Supergrip Retractable and Dr Grip ballpoint pens. Available in blue ink color.