Pratt PRA0821 50PK 100% Recycled Vinyl Record and LP Mailer, Kraft (Pack of 50) 100 percent recycled corrugated box for packing, shipping and storing Pack of 50 corrugated cardboard boxes 32 ect grade for standard stacking performance; rectangular shape fits various items Made of single wall c flute corrugated fiberboard with standard Kraft color Ships flat to reduce shipping costs and storage space