In this work we present a study of the metallic ion and electron emissions from protrusions of ∽2 nm size formed on top of a larger macroscopic base tip. These sources are formed by using field-surface-melting techniques, that is by applying an electric field to a tip of approximately 70 to 100 nm radius, at temperatures of approximately one third of the bulk melting point. By using field emission and field ion microscopies it is possible to characterize the emitting sources. They are found to be pyramids ending in one atom. By controlling the applied voltage (field) and temperature, the sources can emit either metallic ions for positive polarity, or electrons for negative polarity. Since they emit from one ending atom the produced beams are coherent, and they are also self-collimated with an opening angle of ∽2° and ∽4° for ions and electrons, respectively. The experiments are performed with single crystal W〈111〉 and non-oriented Au tips. The determined fields for ion emission are substantially lower than for usual field ion microscopy tips.