Originally Posted by ibemadskillzz
it's a Wilson "Hyper" Prostaff 6.0 Head size 90 which is not available in stores (it's rare). The demo itself was painted like Wilson Hyper Prostaff 6.1, except that it was a Box Beam and the head size is 90. This racquet was sold for a short amount of time but it has been discontinued.
Are you sure that racquet did not have a 95 sq. in. head? What you've described sounds exactly like the racquet sold in Europe (and here on TW) last year but with a 95 head not a 90 head. It was basically a PS 6.0 95 Original with some HyperCarbon added and painted in the same red and yellow color scheme as the HPS 6.1 95. It was called "HyperProStaff 6.0 95 Tour" or just HPS 6.0 95 for short. I have never heard of a 90 sq. in. version of that racquet. If it indeed existed, where was it sold?