Columbian CO752 9x12-1/2-Inch Right Window Grip-Seal Security Tinted First Class Mail White Envelopes, 100 Count Envelope designed for Medicare Form CMS-1500 (Formerly HCFA-1500), Medicaid and other health insurance forms. No folding required. Convenient and secure self-sealing Grip-Seal closure. Simply peel off release strip and press down for a quick, secure seal. Security tinted for added privacy and confidentiality. First Class border ensures priority attention. Window positioned so address on insurance form shows through. Window size is 1-1/8"h x 4-1/2"w, positioned 4" from left, 10" from bottom. Durable 28lb white wove material. 9" x 12-1/2" 100 envelopes Envelope designed for Medicare Form CMS-1500 (Formerly HCFA-1500), Medicaid and other health insurance forms. No folding required. Convenient, secure self-sealing Grip-Seal closure. Simply peel off release strip and press down for a quick, secure seal. Window positioned so address on insurance form shows through. 9 x 12-1/2 Inches. 100 envelopes. Durable 28lb white wove material. Window size is 1-1/8 x 4-1/2 Inches, positioned 4 Inches from left, 10 Inches from bottom. Security tinted for added privacy and confidentiality. First Class border ensures priority attention.