ITEM NAME:2X(Elastomeric Hanger - Spring Vibration Isolator - Anti Vibration Ceiling K2D5) 2X(Elastomeric Hanger - Spring Vibration Isolator - Anti Vibration Ceiling K2D5) 2X(Size: 100mm * 50mm * 50mm or 4 inch * 2 inch * 2 inch . Weight: 0.4kg. Color: black + red Material: plastic + metal Max load: 50kg Endless applications: studio, home, theater, karaoke room Elastomeric elements for excellent noise & vibration control performance Green material without harmful gas, Waterproof & flame retardant Easy installation on ceilings, floors, walls, ducts, HAVC Package Contents: 2 * shock absorbers)