NGS Combinatorial Dual Index Primers Kit for Illumina (Set I) is a dedicated index adapter primer kit for the construction of the Illumina high-throughput sequencing platform library. This kit contains universal DNA Adapter for Illumina, 8 i5 Index Primers, and 12 i7 Index Primers. Along with the Fast DNA Library Prep Set for Illumina & MGI (CW3045) and CWseq Universal DirectFast DNA Library Prep Kit (Illumina & MGI) (CW3048), it can be used to prepare up to 96 different combinations of dual Index-labeled next-generation sequencing libraries. The prepared libraries can be used for sequencing platforms such as NovaSeq, MiSeq, HiSeq 2000/2500/3000/4000, MiniSeq, and NextSeq. All reagents provided in the kit have undergone rigorous quality control and functional verification to ensure the stability and repeatability of the library preparation to the greatest extent.