Constructed of lightweight aluminum this graduated sight scale system easily mounts to the SURE-LOC Carbonic sight via two mounting screws. Laser etched and easy to read, each package includes seven scales with yardage marks ranging from 20 through 160 yards and custom tailored to fit a wide range of bow speeds and set ups. The two-sided design gives users the ability to adjust for different bow speeds. Numbered 1-14 these scales are weather proof, durable and constructed to provide years of service.