As the name says

The 2B grade gives a dark

or even filling larger areas evenly

The ink mixes cleanly between colors while wet

The Alfa is a single-hole sharpener made from untreated beechwood instead of plastic

pilot frixion refill patron 1 0 mm 3 pack FD As the name saysThis Pilot FriXion Ball gel ink refill in 1. 0 mm fits the medium tip size used across the FriXion Ball, FriXion Clicker, and FriXion Pro pen range, with three gel ink cartridges of the same color in each pack. As with the rest of the FriXion line, the ink is thermo sensitive: the friction tip on the pen generates heat, around 60C, that turns the ink transparent on contact, letting you erase and rewrite over the same spot without damaging the paper