PVC sheeting is stretched over an aluminium or steel frame and tensioned like a drum, this will be printed on or have vinyl graphics applied.
A knock in system can also be for average or large sized signs on a flat wall.
The pocket and bar system can be used on large scale signs, usually 18m2 and larger such as billboards where the client would change the face every so often. PVC stretch is the ultimate system to achieving a large flat surface area.
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