The empty gel box allows you to enjoy XCell SureLock™ Advantages of small slots. These gel boxes are sealed on three sides to prevent leakage. It is available in two thicknesses (1.0 mm and 1.5 mm) for seven comb types (1-well, 2-well, 5-well, 10-well, 12-well, 15-well and 2D-well). Since these empty gel boxes are pre-sealed with pre-prepared slots, there is no need for bulky gel-filling racks.