This product includes 160 ul of 10 x Buffer T1, 84 ul of 10 x supercoiled plasmid DNA, 10 ul of 100 x E. coli topoisomerase I, 3 ul of 4500 x Dye H19 and 500 ul of 10 x H19 dilution buffer. It is for 20 DNA relaxation assays in a 96-well plate format or 40 assays in a 384-well assay format.