DOUBLE-SIDED - Made of durable, clear vinyl on the front and back sides of the sleeve for visibility from either side. Heavy duty vinyl construction allows for easy visibility of documents and stitched seams ensure long-lasting utility DURABLE Constructed from a super heavyweight vinyl that allows them to protect pages even in rough, industrial environments. HANGING - 3 hole for hanging on hooks, tacks, nails, etc. VERSATILE - Perfect for attaching to machinery, file cabinets, racking and more.