Quality Park Survivor Tyvek Plain Envelope – Catalog – #90 [9″ X 12″] – 14 Lb – Self-sealing – Tyvek – 50/box – White (R1462). Manufacturer Part Number R1462. Lightweight 14 lb Tyvek. Seam Type: Center; Flap Type: Square; Trade Size: 10 1/2; Security Tinted: No.