Specifications include, but are not limited to: General Requirements Envelopes to be good quality machine-fill envelope. Dimensions and quality to be consistent across manufactured batches. Windows to be securely affixed to within 1.5 mm (1/16”) of top and side edges. Top edge to be flat and free from puckering. Dimensions: 9 7/16 x 4 1/8” Diagonal seams to be securely glued up to top of seam Position of internal side seams to give a minimum 5mm (3/16”) clearance or overlap to the edge of any insert. Pre-scored flap crease to enable the envelope flap to open flat. No twisting, curling or distortion evident. No glue see page on interior or exterior of envelope. Paper smoothness: 100-200 Sheffield units. Large printed areas require approval from the Technical Support Dept. Envelopes not meeting the above requirements may be acceptable, subject to testing and approval by Technical Support Dept. Envelopes not meeting the above requirements may affect machine performance. First line of the Return address copy is subject to change at no charge. Window Size: is 1 ¼ x 3 7/8 Window Position is ½ from left side and 2 ¼ from top and ¾ from bottom of envelope. No tint in the interior of the envelope.