This is like my 5th bow and my first ERC i chose the worst stave I had. It was so thin on one end that i had to do my first inlay( It sucks I know). Thats why there is a hinge in the upper limb near tip and it is so light. I backed it with a peice of fabric that i found at my school. The fabric is some type of canvas. Specs: 35#@26, 20oz, B50. Thanks