These combs are for use when pouring your own special gel types and are available in two thicknesses (1.0 mm and 1.5 mm) and seven well formats (1 well, 2 well, 5 well, 10 well, 12 well, 15 well, and 2D well). They are compatible with our mini-size Empty Gel Cassettes of the same thickness (NC2010, 1.0 mm; NC2015, 1.5 mm).