Floor Mats by . This package is a bulk kit which is a big 50 square foot roll. Since this is a big roll you can cut it as needed without wasting any! Our Rockmat will increase how loud your car stereo plays! It also improves bass quality and eliminates those bad rattling and distortion sounds. Installing Rockmat improves bass quality of the speaker and eliminates those bad rattling and distortion sounds. Butyl rubber is the same material high end speakers surround material is made out of. Our sound dampening product uses 72mil of pure grade aluminum! Most products on the market use 50mil.