100 bp DNA Ladder was designed to determine the size of double stranded DNA fragments from 100 to 2,000 bp. The 100 bp DNA Ladder consists of 13 double stranded molecular weight markers ranging in sizes from 100 to 1,000 bp in 100 bp increments, and additional fragments of 1,200, 1,600, 2,000 bp. The 500, 1,000 and 2,000 bp bands are two times brighter for easy identification.