Blocking Buffer Sampler Kit contains: NORMAL GOAT SERUM (NGS), BOVINE SERUM ALBUMIN - Fraction V (Immunoglobulin and Protease Free), Blocking Buffer (2X) for Fluorescent Western Blotting, ELISA Microwell Blocking Buffer with Stabilizer (Azide and Mercury Free) - Designed for ELISA assays, 10X TBS Fish Gel Concentrate (Azide and Mercury free) is a blocking agent for immunoassays and western blot.