E. coli libraries were created using the NEBNext® Ultra™ II DNA Library Prep Kit for Illumina®, using starting input values of 1,000ng, 100ng, 10ng and 1ng. Libraries were size selected with either AMPure® XP beads or the ProNex® Size-Selective Purification System. Libraries were centered at 300 bp, using recommended library kit manufacturer’s recommendations for size selection with AMPure® XP beads and Promega’s guidelines for the ProNex® Size-Selective Purification System. Post-PCR libraries are shown. Libraries generated using the ProNex® System significantly reduced high-molecular weight DNA carryover and produced tighter size distribution.