TRANGO Rock Prodigy Pulley Kit MASTER YOUR GRIPS - An accessory to the Rock Prodigy and Rock Prodigy Forge, the Pulley Kit works to counter your body weight, lightening you up to practice those difficult grips you wouldn't be able to master otherwise HOW IT WORKS - Eye bolts attach the two pulleys below your training center, on the wall or rack to which it's affixed; One end of your rope clips to your harness, the other end to your desired weight load; Lessen the weight as you build strength throughout your training cycle KIT CONTENTS: 2 Pulleys, 1m 8mm cordelette, 2 Eye Bolts