to be indentical to a normal ball point pen as shown in fig2 the embodiment shown in fig3 a and 3b operates in accordance with the positions shown in fig4 a 4b 5a 5b 6a 6b 7a and 7b fig5 a and 5b show the protuberance 121 of the conducting strip 12 being contact with the cathode plate 16 forming a closed circuit therein and causing the bulb 10 to be turned on the nib 9a of the shank 9 because the ledge 4a is not pressing the protrusion portion 13 of the shield 6 from the top remains in the shaft 2 please refer also to fig7 a and 7b the bulb 10 and the nib 9a according to the present invention are each operable independently for instance when the cap 1 is rotated to a first position in which the protuberance 121 of the conducting strip 12 according to fig4 a is in contact with the cathode plate 16 rather than the shield 6 the shank 9 is pressed downward by the ledge 4b as shown in fig4 b the bulb 10 will turn on and the nib 9a will extend out of the shaft 2 when the conducting strip 12 is rotated to a second position where the protuberance 121 of the conducting stripi 12 is separated from the cathode plate 16 of the engaging member 5 and the ledge 4a is still pressing the protrusion.