This product includes all the reagents for 100 assays of E. coli gyrase DNA supercoiling activity. This product includes 600 ul of 10 x Buffer T2, 405 ul of 10 x relaxed DNA, 8 ul of 4500 x H19 dye, 450 ul of 10 x ATP, 3000 ul of 10 x H19 dilution buffer and 50 ul 100 x E.coli gyrase.