This is a PSI Magnetic Vertex rollerball pen, in gunmetal. I purchased it at Rockler. The blank is an Aquabright called Swirl Blue, from PSI. I believe Aquabright blanks are acrylic acetate, as they turn easily and polish nicely. I used my normal polishing routine: 220-600 grit sandpaper wet; 3M Tri-M-Ite polishing paper, all six grades, also wet; followed by Mequiar's 105 and 205 polishes.