The NCB pendants combine the deflection of the rubber with the advantage of a metal frame that allows breaking the rigidity of the threaded rod that serves as a pendant. The rubber heel has a good deflection to avoid the passage of noise and vibration, and its hardness varies to have several loads depending on the weight to be supported. Comply with ASHRAE, book Applications, pag. 47, sec. 47.44 type 2 “Rubber Hanger”.