Our selection of DNA ladders and DNA molecular weight markers—with fragment sizes ranging from 20 bp to 2.5 kb—are suitable as size standards for various applications, such as nucleic acid size and quantity determination during agarose gel electrophoresis. In addition, we also offer several standard lambda digests and phiX174 digests in low, mid, and high size ranges. These ladders are premixed with loading dye and glycerol for direct agarose gel loading.