Made of 60% PVC and 40% PET, composite PVC PET cards are more durable than standard PVC cards, making them ideal for use when cards will be frequently handled or used in harsh environments. Composite cards are also recommended for use in laminating and retransfer printers because they are more resistant to heat than standard PVC cards, as standard PVC cards may warp from the intense heat used in both of these processes. Composite PVC-PET cards are ideal for use in both direct-to-card and retransfer printers.