The Discovery 2040 unit is 20 wide x 40 high and is ideal for efficient sequencing of DNA or RNA. Its standard size and sturdy construction provide reliable and comparable runs. Complete unit includes single plug power supply lead, one glass plate set (one notched, one rectangular), 1 Teflon© 20-well .4mm comb, 3 spacers, 40 (cm), 4 clips, and instructions.