Edelbrock E-Force pulleys allow you to fine tune the air flow and performance of your E-Force Supercharger system to your preference. They are available in a 6-rib design for use with any of our Stage 3 Professional Tuner systems. These pulleys feature a black anodized finish.E-Force Supercharger Pulley 2.625 in. 6 Rib Design. For Use w/Stage 3 Professional Tuner Systems. Black Anodized Finish.