Description:2PCS Black Passive Radiator Loudspeaker Auxiliary Bass Speaker Specification: Color: Black Size:(Length x Width x Height) 5.7cm x 5.7cm 2.5cm \/ 2.2!#!amp!*!quot; x 2.2!#!amp!*!quot; x 1!#!amp!*!quot; Screw Hole Diameter: 0.4cm\/0.2!#!amp!*!quot; Distance of Screw Holes: 4.8cm\/1.9!#!amp!*!quot; Speaker Hole: 4.8cm\/1.9!#!amp!*!quot;Features: 1.The passive bass radiator is to replace inverted tube. 2.No noise、 higher speed of the voice.Package Included:2!#!amp!*!times;Auxiliary Bass Speaker More Details: