Each of these handmade rollerball pens features a silky smooth writing tip (approximately 0.6 mm), chrome-plated brass fittings, and hand-inlaid panels of saltwater mother of pearl. The screw-on cap is matte DLC PVD coated for exceptional durability. DLC, or “Diamond-Like Carbon”, is a special type of PVD coating that bonds carbon atoms (what diamonds are made of) to the surface of your pen. This advanced process simulates the effect of a layer of diamonds on top of your pen, with all of the protection you would expect from the precious stone. While some makers produce pens with small pieces of mother of pearl, we at believe that the difficulty and cost it takes to use saltwater white mother of pearl of this size and quality creates a stunning effect that is well worth all the work it involves. We use mother of pearl with a hardness of 4.5 on the Mohs scale (as hard as steel). Mother of pearl is a natural material, and every panel is unique. Due to this, some distinctions in the colors and textures in these pens may occur, helping make your pen one of a kind. The rollerball ink refill is a standard rollerball cartridge and is selectively compatible with a variety of commercially available refills Handmade luxury rollerball pen. Silky smooth writing point (0.6 mm). Deeply iridescent Grade AAA saltwater oceanic white mother of pearl inlay The screw-on cap features a matte Diamond-Like Coating (DLC PVD), which adds a layer of incredibly protective ultra-strong carbon to the surface of the metal uses mother of pearl with a hardness of 4.5 on the Mohs scale-as hard as steel. Distinctions and variations in texture of the mother of pearl add beauty and uniqueness to each of these handcrafted pens. There are no two pens alike Diameter: 13 mm. Posted length: 174 mm / 6.85 in. Capped length: 148 mm / 5.83 in. Weight: 56.7 g / 2 oz. Every writing instrument is guaranteed against all defects in workmanship and parts for 3 years from date of sale.