It is available in the new version of Etruria Amber the new innovative Stipula SCS (Self Cleaning System) piston: it guarantees a perfect cleaning of the reservoir every time that the mechanism is used, thanks to the spinning of the head of the piston together with the spinning of the knob. The SCS piston works in a different way from the other pistons: to fill the pen with ink the knob must be turned counterclockwise; to empty it the knob must be turned clockwise.