25 6 x 9 Self Seal Security White Catalog Envelopes 28lb, 25 Count, Security Tinted, Ultra Strong Quick Seal, 6x9 inch (38169) sold2026 which have good corrosion resistance sold2024 which have good corrosion resistance in bad environment Scale Free and Ready for Welding Ultra Strong Quick Seal 10 Security Tinted Self Seal Envelopes 10 Security Tinted Gummed Envelopes 10 Security Single Left Window Self Seal Envelopes 10 Security Single Left Window Gummed Envelopes 10 Security Double Window Self Seal Envelopes 10 Security Double Window Self Seal Envelopes Size Name 10 10 10 10 10 10 Windows Windowless Windowless Single Left Window Single Left Window Double Windows Double Windows Closure Self Seal Gummed Self Seal Gummed Self Seal Gummed Color White White White White White White Security Tinted ✓ ✓ ✓ ✓ ✓ ✓ Envelope Count 500 500 500 500 500 500 Size 4 1 8 x 9 1 2" 4 1 8 x 9 1 2" 4 1 8 x 9 1 2" 4 1 8 x 9 1 2" 4 1 8 x 9 1 2" 4 1 8 x 9 1 2" Weight Premium 24 LB