Columbian CO144 (#10) 4-1/8x9-1/2-Inch Poly-Klear Left Window Grip-Seal White Envelopes, 100 Count Envelope is ideal for all business, professional and personal correspondence. Poly-Klear left window position eliminates need to address envelope. Convenient and secure self-sealing Grip-Seal closure. Simply peel off release strip and press down for a quick, secure seal. Premium 24lb white wove stock. 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" 100 envelopes