Columbian Grip-Seal Security Envelopes , No. 6, 500 Count Columbian White No. 6 3/4" Grip-Seal Security Envelopes 3-5/8" x 6-1/2" 500 envelopes No. 6 3/4 Grip-Seal Envelopes are ideal for all business, professional and personal correspondence Security tinted for added privacy and confidentiality Premium 24lb white wove stock Sustainable Forestry Initiative (SFI) Certified