Read it was the new way to slice bread. Looked at it and made one with items I had around the house. I used it on my wheel bow and on my LB. Sorry but I see no bennefit to it. I see there is a link above about a way to use it to increase your draw weight. I will look into that, but when I used this, my arm stayed back, so Im assuming that means I am using back tension, or only letting go with my fingers and still keeping what ever muscles are needed tense. Your experience may differ........