Edelrid OHM For sale as I have no opportunity to use it. It has been used, but is still in good condition. Recommended for those with a significant weight difference with their partner. An assist brake resistor that increases rope friction when there is a large weight difference between the belayer and the lead climber. In the event of a fall, the OHM increases the amount of friction on the rope, allowing a lighter belayer to easily hold a heavier lead climber. The belayer requires significantly less hand braking force to stop a fall. Lowering a heavy climber is much easier to control. The OHM is attached to the first bolt of the safety chain. If the lead climber falls at the first bolt, the OHM significantly reduces the risk of falling to the ground. It does not affect rope handling when belaying the lead climber (there is no additional friction when paying out rope). Recommended weight difference (Lead climber > belayer): 10~40kg. Minimum belay weight: 40kg for 8.9~11mm single ropes CE marking: CE 0123 Weight 470g