This product includes 400 ul of Buffer RP, 33 ul of 100 x DNA, 33 ul of 100 x NTP mix, 5 ul of 1000 x pyrophosphatase, 33 ul of 100 x E. coli RNA polymerase and 4500 ul of dye for 100 assays of E. coli RNA polymerase reactions in a 384-well assay format.