Aluminum tent Arabian Tent German Hanger Warehouse Tent Keder factory Keder Maker Keder solution 12mm Double Flap Keder has two flaps, which â??sandwichâ?? the fabric and then are welded or sewn to the fabric. As there are three layers of fabric to be welded at the same time, it is recommended to be welded using a radio-frequency welder. We manufacture Keder with sizes from 4mm to 15mm for various applications and with various configurations. Application: Pagoda Tents, Marquees, Tent, Wedding tent, Aluminum Tent, Arabian Tent, German Hanger, Warehouse Tent, Membrane Structure, Tent Manufacturer, Canopy Structures 1) 12mm Keder With Flap 30mm 2) 12mm Keder With Flap 40mm