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.
TMB/E Single Reagent, Blue color, Horseradish Peroxidase Substrate (soluble) - (TMB/E Single Reagent, Blue color, Horseradish Peroxidase Substrate (soluble))
SDS