Professor Wenk uses a scanning electron microscope (SEM) device to determine the material composition of the card. Apple previously stated that the white surface treatment of the card was achieved through a "multi-layer coating process" added to the titanium-based material.

However, although the use of unique alloy materials can have a gorgeous appearance, it is difficult to achieve durability. In a recent supporting document, Apple said that if the card comes in contact with a hard surface or material, the coating may be damaged. Apple also said that some fabrics, such as leather and denim, may cause the cards to become permanently discolored and difficult to wash off.

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