Computer heat shrinks are extruded. Coming out to the die they would look like a bunch of "W's" lined up if you were to look at the them from the end. They are then cross cut to make the little points.
Window frames that are rolled out of sheet will have a seam which is crimped. If you look at one of these frames from the end you can also see how the sheet was rolled to form the shape of the frame then crimped.
Extruded window frames need to have the die cast clips which normally hold the ends together removed or cut off from the ends in order to receive extrusion price. If the clips in the ends are not removed or the window frames still have screws in them we buy them as old sheet. This may be why you didn't receive extrusion price for them because they were not clean or the scale operator didn't think you knew the difference and paid you less trying to make themselves more.
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