The Fusion Microslides from BTX Harvard Apparatus are designed to fit on a microscope and allow observation of the dimer formation during electrofusion. They are composed of a glass slide and two strips of stainless steel (wire or bar) and are available in 0.5 mm, 1.0 mm, 3.2 mm and 10 mm gap sizes. The slides work with the companys ECM 2001 Electrofusion device.