i used a plastic chopping board heated and bent it a little , glue some foam on the inside , cut some straps from a back pack and sowed them on , the arm is bent alloy and the camera mount is made out of alloy angle and the counter weight is a must is you have a long arm for the camera , there is a strap on the front that links the 2 straps and pulls them together to stop any movement , you can't even notice you have it on it sits just above your harness and in between your shoulders . it was a rush job but it works perfect