Using 81.5% recycled content, the Pilot G-Knock is the G-2 for the Eco-Friendly crowd. When you purchase this pen, you are buying the G-2 ink cartridge with G-Knock BeGreen recycled barrel, so feel free to swap any of your G-2 refills into these barrels. I really like this barrel design - the grip is smooth and very comfortable and makes me want to convert all of my G-2's into these G-Knock barrels. I picked up this black 0.7mm five pack at Staples, and JetPens carries the 0.38mm model.
Posting is going to be light the rest of the week, so I hope everyone has a Merry Christmas!