What service is suitable for mailing fragile items internationally?

Priority Mail Express is the most appropriate service for mailing fragile items internationally due to its combination of speed, reliability, and additional care features. This service offers guaranteed delivery within a specific timeframe, which is particularly beneficial for fragile items that may be sensitive to delays during transit.

Additionally, Priority Mail Express includes features such as tracking and insurance coverage. The tracking allows senders and recipients to monitor the package's journey, providing peace of mind about its status. The insurance feature also offers financial protection in case of damage or loss, which is crucial for fragile items that are more susceptible to harm during shipping.

While other options may provide various benefits, such as affordable rates with Media Mail or some security with Registered Mail, they do not offer the same level of expedited service and protection specifically tailored for fragile shipments. First-Class Mail, while cost-effective, lacks the additional safeguards and speed that Priority Mail Express provides, making it less suitable for items that require special handling.