Materials: PSK/A4: Moulded in PVC (polyvinyl chloride) G-PSK/A4-A: Plastic. RAL 7035 color Characteristics: for housing drawings and documents. PSK/A4: applied inside the door on CVT - CVHT - CVN - CVHN - CVL - CVU size enclosures and subversions. G-PSK/A4-A: Fastening with double-sided adhesive.