This is a complete stand-alone unit for tank electroblotting that holds up to 4 mini gels (8 x 8.5cm. This unit contains the tank, lid, electroblotting insert, 4 color coded cassettes and 16 fiber pads. Run time is flexible to meet your needs and can range from overnight to just a couple of hours. The open design, rigid cassettes maximize current transfer and eliminates shadow band formation.