A showerhead is a very simple type of perc consisting of a hollow glass sphere with evenly spaced openings. The perc resembles a typical showerhead, much like what you'd see on a watering can. The openings in a showerhead perc can be either slits cut into the glass while it's cold or holes pushed into the glass while it's hot. Showerhead percs break up the smoke stream and prevent large pieces of plant debris from getting further into the pipe. Because they're relatively simple, showerhead percs can scale across a range of sizes and are often used to cap downstems or in conjunction with other percs (such as in the coil showerhead water pipe).