Parker compatible refill. Black titanium and platinum accents. There are only 4 of these blanks available for assembly on the four styles of pens offered. When they are gone that’s it. Can reconfigure for a left handed writer. Let me know in the comments when purchasing. $40 of the cost of this pen will be donated to Feeding America or the food bank of your choice (let me know in the comments). Note: Unless you are the first buyer, this will not be the pen you receive.