Process for producing broad molecular weight polyolefin

A process for producing a polyolefin having a molecular weight distribution[, i.e. M.sub.w /M.sub.n,] greater than 3 comprising polymerizing an olefin or copolymerizing at least two olefins under suitable polymerization conditions in the presence of a catalyst system prepared by combining at least a first and a second metallocene characterized by the fact that said first metallocene is a bridged metallocene containing a fluorenyl group and said second metallocene is an unbridged metallocene and further by the fact that said first metallocene if used as the sole metallocene to prepare polyolefin under those same polymerization conditions would produce a higher molecular weight than said second metallocene would produce if used as the sole metallocene to prepare polyolefin under those same polymerization conditions.