OFC: It means Oxygen Free Copper, 99% pure. This feature considerably improves the electrical conductivity.
PVC: It means Polyvinyl chloride, a plastic polymer normally used for the single conductors or for outer sheaths insulation. Its temperature range is -15/+70°C.
PPE: It means Polypropylene, its a thermoplastic polymer commonly used as insulator of the cable inner elements. Material rather stiff but with high mechanical and high temperature resistance.