Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
MILLIPLEX MAP Human Cytokine/Chemokine Magnetic Bead Panel IV, Premixed 20 Plex Assay - (MILLIPLEX MAP Human Cytokine/Chemokine Magnetic Bead Panel IV, Premixed 20 Plex Assay)
SDS