Mount Board Double thick Ivory/Silver 40.6x50.8cm with 27x34.6cm Window (10 pieces) [MD20029] pink Then item B12NF is exactly

Then item B12NF is exactly what you are looking for

Thickness: 100 micron

Reclosable: yes (adhesive strip attached to the back of the bag instead of the flap)

Brown Bag Envelopes have the following features:

Thickness: 250 micron

Mount Board Double thick Ivory/Silver 40.6x50.8cm with 27x34.6cm Window (10 pieces) [MD20029] pink Then item B12NF is exactlySize: 40,6x50,8cm Cut out Size: 27x34,6cm Color: Ivory Silver One pack contains: 10 pieces PH neutral Standard Decorative Double Mats by Crescent are quality buffered pH Neutral matting at an economical price. Double mats have a 0,5 cm reveal. Store flat in dry climates to avoid warping. Mat board does not come With backing boards. To match these double mats, be sure to get backing board that corresponds to the outer dimensions.