Our RedStar 1kb DNA Ladder is used to estimate the size of double-stranded DNA ranging from 250-10,000 bp. This ladder includes 12 double stranded DNA fragments, some of which are visible at higher intensities for quick identification. This product comes ready-to-use and is pre-stained with RedStar DNA/RNA Loading Dye. These products are not for use with gels containing EtBr or other fluorescent dyes.