Tombow OBJECT Roller Ball Pen, Ergonomic Design, Sapphire Blue (55037) Lightweight aluminum body & firm comfortable ribbed grip 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