New Guardian Heavyweight Manilla Board Backed Envelopes Send documents with confidence in these high quality manilla board backed envelopes which provide a combination of good looks and strength Exceptionally strong 130gsm ribbed manilla paper across the whole range Subtle ribbed texture and distinctive sheen provides an attractive finish Backed with a sturdy board to keep contents flat and protected Printed 'Please do not bend' instructing considerate handling Peel and Seal gumming for an exceptionally strong seal Window: 40 x 100mm 25mm in, 213mm up Size: C4 324 x 229 mm Packed 125