Feature●Size: Width 11.3 inches (287 mm) x Top 15.0 inches (382 mm) + Flap 1.7 inches (42 mm) Rice Tsubo: 4.7 oz/yd2 (120 g/m2 Installation Method: Medium paste, Post frame: Cubic glue: Pear Window: Pear Contents: For B4 (roomy)●These envelopes are made of semi-bleasted kraft paper that is the best choice for tea envelopes. The contents are not easy to see through, so they are often used as office envelopes●The 0 square envelopes are non-shaped envelopes also known as square #0 that allow the B4 to fit in without folding. It is wider than 1 corner, so you can hold thicker items●Uses forest certification paper. Green Purchasing LawDescription