The 100bp DNA Ladder contains 11 double-stranded DNA fragments from 100 to 1,000 bp in 100 bp increments, plus 1,500, 2,000, and 3,000 bp fragments. Bright 500 bp and 1,000 bp bands make size estimation easier. Supplied ready-to-use, this ladder is compatible with ethidium bromide and other standard DNA staining methods, providing reliable size determination for PCR products and engineered DNA fragments.