PRESERVE PHOTOS - Archival quality card stock ensures your cherished photos and documents remain safe from deterioration, maintaining their integrity for generations to come. ACID-FREE - Buffered with alkaline reserve calcium carbonate, this card stock prevents acid migration, protecting your prints and documents from yellowing and embrittlement. ARCHIVAL CERTIFIED - Passes the Photographic Activity Test (PAT) ISO IT 18916, guaranteeing its safety for long-term contact with photographic materials, ensuring peace of mind. DURABLE MATERIAL - Made from alpha-cellulose pulp, this 148 gsm card stock provides a sturdy and reliable backing for your prints, offering both protection and professional presentation.