This is a beautiful well-balanced pen with some heft and size. We use Hawaiian Koa which is inlaid with Italian acrylic or surfboard resin, and the metal hardware is plated with titanium oxide or chromium. As with all pens made by Lau Lau Woodworks, it is water and chemical-resistant because of the special finish applied to each pen. This takes a Parker-style refill. *Each of our pens is branded individually by hand with our company logo, the laulau. You will find the logo next to the pen clip. This is to certify that you have a Lau Lau Woodworks pen.