Tungsten sinkers are perfect for dropshot rigs, the metal is more dense than lead and legal to use everywhere in smaller sizes. The biggest advantage is that it drops quicker and stays down without getting stuck as easily because it's nearly half the size of the same weight lead sinker.
These come rigged with swivels on all sizes, the larger 14g and 21g have a standard ring and the smaller sizes have a clip to pinch the line where you want it to stick.