Thanks everyone. Steve, it's actually on sticky backed paper. It feels 'velvety' to touch and the backing is REALLY sticky, once on it's a bugger to take off......my kind of material. The three sheets of acrylic are floating, this was in case he wants to go to the next reunion and he would'nt look so cool wearing this picture (lol). The back has an easy release so that the medals might be removed if necessary. All I did was make sure that the fit inside the frame was to the 'inth' of a millimetre and it all just pushed in with a tight fit.