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.
Safety Data Sheet for SMC™ optimization kit, Bead-Based Assay Buffer Optimization Kit 03-0122-00
Material Safety Data Sheet or SDS for SMC™ optimization kit, Bead-Based Assay Buffer Optimization Kit 03-0122-00 from Merck for download or viewing in the browser.