This is one green Schmidt P8126 Capless System roller ball pen refill. This is the short model version, and the stainless steel tip has a 0.6 mm ceramic ball. It has a one year cap-off time, meaning that the ink does not dry out even if left uncapped for one year. This refill is compatible with the Retro 51 Tornado pens listed under Compatible Products.
I was wait for the bright green pen so was excited when the Green Retro 51
became available. The green Schmidt ink seems to flow better at start up than
the black ink that came standard with the pen. The black standard ink seems to
smear slightly upon impact on paper as the green ink. Very minor. While in
have not tested the two inks back to back, the green Schmidt ink seems to take a
tad longer to dry than the standard black ink. I still rated the green Schmidt ink a 5 and will buy it again.