Bold black lines help you see locate where to write both the mailing address and return address Our Low Vision Envelopes make it easy for those with macular degeneration, diabetic retinopathy, glaucoma, retinitis pigmentosa and other low vision conditions to address envelopes. White with six bold black lines: 3 lines in the upper left for the return address, plus 3 lines for the destination address. Standard Number 10 sized business envelopes. Measures 9.5 x 4.25. Package of 100.