We exhibit products of Mandelbrot sets in the two-dimensional complex param
eter space of cubic polynomials. Cubic polynomials in such a product may be
renormalized to produce a pair of quadratic maps. The inverse construction
intertwining two quadratics is realized by means of quasiconformal surgery
. The associated asymptotic geography of the cubic connectedness locus is d
iscussed in the Appendix. (C) Elsevier, Paris.