The q connect manilla window envelopes are made of extra strong 115gsm paper with a peel and seal flap thats more secure than gummed or self adhesive closures just peel off the protective tape and press down on the flap to seal securely these c5 envelopes are designed for unfolded a5 documents or folded a4 documents plain manila pocket envelopes made of top quality 115gsm paper peel and seal flap format c5 229 x 162 mm suitable for a5 or folded a4 documents pack of 500 envelopes