A specialized device for specialized ropes. Compact and ultra-light, the Micro Jul device is designed by Edelrid for belaying climbers using half and twin ropes between 6.9mm and 8.0 mm in diameter. It can also be used for rappelling, especially on skinny rope such as the 6mm Rap Line. An ISPO 2013 award winner, the Micro Jul weighs just 62 grams (2.2 ounces) and features multiple friction options depending on how you feed in the rope. The best description can be found in this video.