From the early study of Graphene as a 2D crystal, a great amount of research was dedicated to novel 2D materials, analysing their electrical, thermal, mechanical, optical, magnetic and superconductivity properties. One of these novel materials is Borophene, first obtained in 2015. In this work, we study, numerically, the electronic properies of 3 allotropes of monolayer borophene, which present metallic behaviour.