The GH1382QD Series 1 Center Ball Head from Gitzo is an Arca-type compatible ball head that is compatible with Traveler Series 2 and Mountaineer Series 0 and 1 tripods, has a load capacity of 31 lb, an independent panning lock for 360° rotation, and a height of 4.4". The head weighs 1.1 lb and has a tungsten disulfide coating to help keep the ball movement smooth while it minimizes sticking and slipping. A screw lock lock tightens down on the included quick release plate, and a bubble level helps maintain straight horizons in your images. To allow for precise adjustments, a friction control dial is integrated into the large locking knob.