The Dynabeads Protein A/Protein G and Magnet Starter Pack combines Dynabeads Protein A and Dynabeads Protein G magnetic beads for immunoprecipitation with the magnet preferred for use with 1.5 mL microcentrifuge tubes for purchasing convenience. This pack is ideal if you don't know whether Protein A or Protein G is best for your application or if you prefer to use a combination of both. The beads are sufficient for 40 reactions, and the magnet holds 16 x 1.5 mL microcentrifuge tubes. Dynabeads Protein A beads, Dynabeads Protein G beads, and the DynaMag-2 magnet are also available separately.