DS18 PRO SDF6 was designed to project the sound to obtain a higher pitch while keeping the sound quality and improving decibels MOUNTING - The speaker diffuser is mounted on top of the speaker. Please ensure to measure your speaker screw holes to verified that the diffuser will fit. Please see the pictures to obtain the measurements. MATERIAL - The structure is made with a very sturdy plastic and the process is injection ABS molding to obtain the smooth finish! IN THE BOX - 1 x 6.5-inch speaker diffuser, 4 x 1 1/8" screw, 4 x 3/4" screw, 4 x nut, 4 x washer