151 Series Starter Kit - Non Adjustable Sequencing Apparatus - 20cm x 40cm is Dan-kar's simplest and least expensive line of sequencers. Model #151N produces a gel running length (40cm) but is narrower (20cm) and can also be used to do SDS-PAGE.STARTER KIT COMES WITH THE FOLLOWING:151N Unit Complete with safety cover & leads151N-BG Blank glass plate (20 x 40cm long)151N-NG Notched glass plate151-SA Spacer (3 set)151N-CA10 Comb 0.4 mm thick, 10 teeth