Molded with 90% recycled polypropylene that's 100% recyclable (both ring and cover). This means no disassembly is needed to recycle. Heavyweight construction with durable living hinge has been cold-crack tested to 10 degrees and so durable, it's guaranteed five years not to crack or break. One touch trigger opens rings to two positions: halfway for easy page viewing and completely for loading. Ergonomic grip on the spine makes shelf removal easier. Oversized label holder on spine. Non-stick and archival-safe.