The PRS X-Change Torque Tune Spacers allow you to torque tune your R7 Arrow Rest. Our Precision Rest Series (PRS) system utilizes 0.3″; 0.4″; and 0.5” spacers that can be exchanged and stacked in combination to move the R7 arrow rest further from the bow riser to optimize forgiveness in the bow system. *Compatible with the R7 arrow rest only. [Patent Pending]