Ideal for mailing bulky items such as catalogues; reports; brochures and more; these Plus Fabric envelopes feature an expanding 25mm gusset and durable; heavyweight 120gsm bright white paper. The envelopes also feature a convenient address window measuring 45 x 100mm and simple peel and seal closure with Power-Tac adhesion for a quick; strong seal. Suitable for A4 documents; this pack contains 100 C4 envelopes.