The functional analysis of all the becs and becs tips from the upper level of the Magdalenian site of Verberie “Le Buisson Campin” (Oise) sheds light on a differential production and use of these tools. The Campanian flint was used to produce thin and narrow blades used for piercing while the more tenacious Santonian flint was used to produced becs on wider and robust blades that were used for boring as demonstrated by breakages as well as microwear traces.