It is not possible to use product properties for delivery pricing when using Manual Shipping/Manual Mailing. This feature is designed to use with FedEx / UPS delivery providers etc.
where it says: "You can define a product property that affects delivery cost calculations. For example, you can define several types of paper (for example, matte, glossy and plain) where each paper type has a different weight and thus affects the delivery cost when sending via a delivery provider such as FedEx or UPS."