The 1 Kb Plus DNA Ladder is a powerful tool for estimating the molecular weight of linear double-stranded DNA fragments. The 1 Kb Plus DNA Ladder has 12 evenly spaced bands ranging from 1 kb to 12 kb, a quick orientation band at 1,650 bp that forms a distinct doublet with the 2 kb band, and seven bands of round-number sizes below 1 kb. This wide size range is perfect for downstream cloning applications as well as PCR and other molecular biology applications.