1st class international is a USPS shipping service designed for small, lightweight packages and letters sent internationally. First-Class International Mail offers a more affordable option for international shipping compared to other USPS services. It is ideal for items like documents, postcards, and small goods that weigh up to 4 lbs. Delivery times for First-Class International vary depending on the destination country, but it typically takes anywhere from 7 to 21 business days to reach its final destination. This service also includes limited tracking for certain countries, providing peace of mind for international shipments.