A flag pin is provided comprising a straight pin with a sharpened end, a flag positioned at the opposite end of the pin, a vertical, cylindrical sleeve positioned around the pin, and a flexible base configured to receive the sharpened tip of the pin therethrough and to abut the bottom of the cylindrical sleeve. In use, a user inserts the flag pin into the cylindrical sleeve so that the sharpened tip of the pin extends out of the bottom of the sleeve, and moves the bottom of the pin into and through the flexible base so that the top of the flexible base comes to rest against the bottom of the cylindrical sleeve. In this configuration, the bottom end of the pin may then extend into a base on which the pin is to be placed, with the flexible base vertically supporting both the cylindrical sleeve and the pin itself, and holding the pin in a generally vertical orientation. A kit for assembling such flag pins and a method of its use are also provided.