Capacity and design: 4 card slots per page, double-sided design with 50 removable pages, holds up to 400 cards. Compact and lightweight for easy transport and quick access. Durable construction: Made from ECO PU leather with a zipper closure. Dustproof and anti-twist design helps prevent loss, wrinkles, and cracks of cards. Card protection and maintenance: Transparent slots are fade-resistant and deformation-resistant, odor-resistant, sturdy, and easy to wipe clean. Cards stay visible and protected. On-the-go practicality: Soft yet sturdy for outings, travel, or school. Designed for effortless card sharing and collecting wherever you go. Compatibility and protection: Compatible with standard cards including trading cards, sports cards, and playing cards. Keeps cards securely in place to avoid bending and wear. Use cases: At conventions or meetups to swap cards; while traveling to organize a sports-card collection; in class or club to share and store trading cards.