A retractable adaptor, wherein the adaptor comprises: an adapter body (110; 210; 410; 510; 610) having a distal end and a proximal end; a lumen (111, 211) within the adapter body (110; 210; 410; 510; 610) suitable for enclosing an off-the-shelf writing instrument having an outer tube and a filler being a reservoir that holds ink and being coupled to a writing tip; an opening (152; 252; 452) at the distal end of the adapter body (110; 210; 410; 510; 610) suitable for allowing the writing tip of the off-the shelf writing instrument to pass through; a holder (120; 420; 520; 620) disposed within the lumen (111, 211) of the adapter body (110; 210; 410; 510; 610) suitable for contacting the off-the-shelf writing instrument; wherein the retractable adaptor is suitable for holding the off-the-shelf writing instrument having the outer tube of an outer diameter of at least 6 mm and the writing tip; and wherein a retractable mechanism which is capable of selectively moving the holder (120; 420; 520; 620) within a defined longitudinal distance within the adapter body (110; 210; 410; 510; 610) such that movement of the holder towards the distal end is suitable for causing the writing tip to extend through the opening and be exposed from the adapter body (110; 210; 410; 510; 610) for writing, and movement of the holder (120; 420; 520; 620) towards the proximal end is suitable for causing the writing tip to retract through the opening (152; 252; 452) and be hidden and protected within the adapter body (110; 210; 410; 510; 610); wherein the diameter of the inner side of the holder narrows towards one of the distal and proximal end of the adapter body thereby forming a narrowed portion so that a contact surface at least partially disposed on an inner side wall of the narrowed portion of the holder (120; 420; 520; 620) is suitable for making engaging contact with the off-the-shelf writing instrument by securely gripping the off-the-shelf writing instrument; and in that the contact surface frictionally engages with the outer tube of the off-the-shelf writing instrument; characterized in that a resilient material is disposed on the contact surface of the holder (120; 420; 520; 620) to be suitable for frictionally engaging with the outer tube of the off-the-shelf writing instrument, wherein the resilient material is at least one selected from the group consisting of foam, rubber, and plastic. an adapter body (110; 210; 410; 510; 610) having a distal end and a proximal end; a lumen (111, 211) within the adapter body (110; 210; 410; 510; 610) suitable for enclosing an off-the-shelf writing instrument having an outer tube and a filler being a reservoir that holds ink and being coupled to a writing tip; an opening (152; 252; 452) at the distal end of the adapter body (110; 210; 410; 510; 610) suitable for allowing the writing tip of the off-the shelf writing instrument to pass through; a holder (120; 420; 520; 620) disposed within the lumen (111, 211) of the adapter body (110; 210; 410; 510; 610) suitable for contacting the off-the-shelf writing instrument; wherein the retractable adaptor is suitable for holding the off-the-shelf writing instrument having the outer tube of an outer diameter of at least 6 mm and the writing tip; and wherein a retractable mechanism which is capable of selectively moving the holder (120; 420; 520; 620) within a defined longitudinal distance within the adapter body (110; 210; 410; 510; 610) such that movement of the holder towards the distal end is suitable for causing the writing tip to extend through the opening and be exposed from the adapter body (110; 210; 410; 510; 610) for writing, and movement of the holder (120; 420; 520; 620) towards the proximal end is suitable for causing the writing tip to retract through the opening (152; 252; 452) and be hidden and protected within the adapter body (110; 210; 410; 510; 610); wherein the diameter of the inner side of the holder narrows towards one of the distal and proximal end of the adapter body thereby forming a narrowed portion so that a contact surface at least partially disposed on an inner side wall of the narrowed portion of the holder (120; 420; 520; 620) is suitable for making engaging contact with the off-the-shelf writing instrument by securely gripping the off-the-shelf writing instrument; and in that the contact surface frictionally engages with the outer tube of the off-the-shelf writing instrument; characterized in that a resilient material is disposed on the contact surface of the holder (120; 420; 520; 620) to be suitable for frictionally engaging with the outer tube of the off-the-shelf writing instrument, wherein the resilient material is at least one selected from the group consisting of foam, rubber, and plastic.