Photos: A. Fountain Pen (open); B. Rollerball Pen (open) C. Both Pens Closed
Cap screws on barrel with a fast 1/4 turn (Quad Thread).
Cap posts on end of barrel with a fast 1/4 turn
Elegantly styled finial and end of barrel stud
Requires no cap adjustment or readjustment
Tight seal to keep ink fresh
A true "professional" looking and functioning pen