Tombow ZOOM 2000, Aluminum Barrel Roller Ball Pen, Chrome (55000) Futuristic design and superbly balanced barrel for enhanced writing performance Smooth writing with premium Tungsten carbide rolling ball cartridge Waterproof, fast-drying pigment ink - won't smear, skip or fade Black Ink, Medium point, 0.5mm Refillable with all Tombow ROLL Pen Refills