Designed to give you the best sound, SoundSkins had built a sound system bundle designed to drive the sound of these speakers in to the cabin and not into the surrounding enclosure. Pairing the DS 18 PRO-ZT6 coaxial speaker with their wavy foam sound ring technology will fit that goal perfectly. The PRO-ZT6 has a sleek design that ensures minimal distortion, a smooth response, and incredible sound detail. Constructed with a paper core, with a clothed upper surround that is inlayed to a steel basket frame and supported with a 27 oz. ferrite magnet . Fitting multiple applications like cars, truck, UTV, and motorcycles the PRO-ZT6 is a versatile speaker only enhanced when paired with the SoundSkins speaker ring system. The SoundSkins speaker ring system, is a 1" closed cell foam that encompasses the circumference of the speaker edge sealing the mounting face to ensure that sound travels forward and not to the sides and a wavy foam backing plate to catch the vibrations and keep them from return through the speaker. Avoid the rattles and hear the music, SoundSkins can make it happen for you and your stereo system. This is a single unit only.