Abstract: A ring assembly for a pen has a bottom ring, a top ring, and a slender bridge connecting the bottom ring and the top ring. In assembly, a barrel of the pen extends through the bottom ring and the top ring, so that a sticker adhered around the barrel is securely attached to the barrel by clamping of the top ring and the bottom ring. Furthermore, a gap formed by two conjunct sides of the sticker is concealed by the bridge. By such arrangement, the ring assembly is able to be decorative and to avoid peeling of the sticker from the barrel after long-term use.

Abstract: A dual-purpose pen has a barrel, a cap engaged with the barrel, and a ball point that is extendable from the end of the barrel, and a key-pressing point that is extendable from the end of the cap. The pen can be used for writing when the ball point is extended and for pressing keys when the key-pressing point is extended.

Abstract: A pen having a 3-dimensional pattern thereon is disclosed. There is a aperture defined in a sidewall of the barrel or pen cap of the pen. A flexible strip having a 3-dimensional pattern thereon is suitably deformed and placed inside the barrel or pen cap whereby the 3-dimensional pattern of the flexible strip protrudes through the aperture. A liner ring is further plugged into the barrel or the pen cap so that the flexible strip is securely clamped between the barrel or pen cap and the liner ring. Consequently, the 3-dimensional pattern is securely fixed on the pen.

Abstract: A light pen comprises a barrel defining a chamber therein, a cap detachably mounted on the upper end of the barrel having a cavity defined therein, a luminous bar disposed in the cavity of the cap and received in the chamber of the barrel. The luminous bar can be reversed on the barrel to provide a warning.