Shellac Tubes drop into the 3X Master Clamps to hold small pieces such as earrings, pendants, or other items. The ability to use two shellac tubes at a time allows for greater efficiency. Available in four sizes to save time heating. (1) 39 mm tube, (2) 20 mm tubes, (2) 15 mm tubes, (2) 11 mm tubes. This fixture is compatible with the Jura by GRS 3X Line.