This is my first time using these components. I have to say I really like this pen. It uses 8 mm tubes and Parker refills. I don’t do a lot of acrylic but I accidentally bought some 5/8 blanks and this was a perfect opportunity to use one. Blank is a blue Damascus in inlace acyrlestor. The clip measured .010 larger than the bushings, pays to measure before you turn. Pen plating is gunmetal. It just feels like a really nice, quality pen in your hand.