Just slip the form inside and seal. You'll save hours of addressing time. A Self-Seal (product 92663 ) version of this envelope is also available

Envelope Size: 8 3/4 X 3 5/8

Upper window is 3 3/4 x 7/8 and 3/8 from left and 2 5/16 from bottom
Lower window is 3 3/4 x 15/16 and 3/4 from left and 11/16 from bottom

Price is for 250 envelopes.