  This paper presents a new complete and well defined sample of Flat Spectrum
Radio Sources (FSRS) selected from the CLASS survey with the further constraint
of a bright (mag<17.5) optical counterpart. The sample has been designed to
produce a large number of low-luminosity blazars in order to test the current
unifying models in the low luminosity regime. In this first paper the new
sample is presented and the radio properties of the 325 sources contained
therein discussed.
