The dsRNA Marker Easy is supplied in a ready-to-load mixture of loading dye (containing Tris-HCl buffer, glycerol, EDTA sodium salt, sodium chloride, bromphenol blue) and an ideal size marker for determinating sizes of double-stranded RNAs. The dsRNA Marker Easy consists of ten double-stranded RNAs, 10, 20, 30, 50, 100, 200, 300, 400, 500 and 1,000 base pairs. In 5 ul of the dsRNA Marker Easy, a 20 bp of dsRNA is approximately 50 ng. The dsRNA Marker Easy can be visualized by UV light after ethidium bromide staining.