Security Window White Business Envelopes Blue tint on the inside for privacy of contents. Standard 1-1/8h x 4-1/2w left window position. 500 envelopes per box. Diagonal Seam Construction V-flap. #10 Trade Size 4-1/8 x 9-1/2 WEIGHT: 6 lbs. SOLD AS: Box STOCK NUMBER: 90130