A steel bridge mounted to your guitar will absorb a lot of the frequencies that your strings are resonating at.  This will take away from the tone and sustain. With a light weight bridge you are opening up a passage way, linking your strings with your guitars body.  Now your letting the body of your guitar provide you with your sustain and ultimately bring out all the colors and tone of your wood.  Already loaded with our String Saver saddles, your bringing out the harmonics, increasing sustain and opening the guitar to another world of potential.