The present disclosure relates to a writing instrument comprising a self-healing sealing component to prevent drying out of the writing instrument.

The present disclosure relates to a dual twist structure, an object ejecting device including the same, and a structure for sealing the same, the dual twist structure including: a housing configured to accommodate a content cartridge therein and having a cam groove provided at a tip thereof; a sleeve coupled to and fitted with the content cartridge and having a cam protrusion formed on an outer portion thereof; and a tubular operation body having a twist cam groove into which the cam protrusion is slidably fitted, and a cam pin protruding and configured to move to a position misaligned with the twist cam groove by being guided by the cam groove, in which the dual twist structure has the two cam grooves.

A dual twist structure, an object ejecting device including the same, and a structure for sealing the same, the dual twist structure including: a housing configured to accommodate a content cartridge therein and having a cam groove provided at a tip thereof; a sleeve coupled to and fitted with the content cartridge and having a cam protrusion formed on an outer portion thereof; and a tubular operation body having a twist cam groove into which the cam protrusion is slidably fitted, and a cam pin protruding and configured to move to a position misaligned with the twist cam groove by being guided by the cam groove, in which the dual twist structure has the two cam grooves.

A writing instrument may include a self-healing sealing component to prevent the internal components of the writing instrument from drying out.