Kicker 51KSC3504 KS 3.5" 89 MM COAXIAL SPEAKERS*Please note, this is a special order item which means we order it in from our suppliers per every order. This could take up to 10 working days* The high performance woofers utilise internally dampened polypropylene cones and tough rubber surrounds for outstanding mid range detail and pounding bass! All KS Series woofers feature an ultra slim mounting depth to easily fit in most factory speaker locations. With only two millimetres of tweeter