Columbian CO171 (#10) 4-1/8x9-1/2-Inch Poly-Klear Left Window Security Tinted White Envelopes, 500 Count Envelope is ideal for all business, professional and personal correspondence. Poly-Klear left window position eliminates need to address envelope. Security tinted for added privacy and confidentiality. Premium 24lb white wove stock. Executive Style diagonal seam V-flap construction. Moisture activated gummed seal. Window size is 1-1/8"h x 4-1/2"w, positioned 7/8" from left, 1/2" from bottom. (#10) 4-1/8" x 9-1/2" 500 envelopes