Interchangable spray-can nozzles fitted to the can to vary the width of spray. These are usually racked off of commercial products, such as K-Mart's Bug and Tar, various cleaning products or starches. Many stores and graffiti fanzines sell caps nowadays. Also referred to as "tips" (as in "flare tips" and "thin tips".) The really big fat caps are sometimes called "softballs" because of the wide and soft-looking spray they produce. Tips are sometimes referred to by a certain number of fingers, corresponding to the width of the spray (for example, a "four-finger spray" would be about as wide as your hand. The number on the front of a tip is the catalog number for that model.

This definition is in context to Graffiti. See more contextual defintions for Cap, Fat Or Skinny (Tips).