First-class envelopes feature super strong, regular weight Tyvek for secure mailings. Made of moisture-resistant and tear-resistant material.
                                                                             
                                    
                                        
                                                                                               General Information 
  Manufacturer:  Sparco Products
  Manufacturer Part Number:  19757
  Product Name:  Tyvek Open-End First Class Envelopes
  Packaged Quantity:  100 / Box
     Product Information 
  Mailer/Envelope Type:  Document
  Mailer/Envelope Classification:  #10 1/2
  Mailer/Envelope Width:  9"
  Mailer/Envelope Length:  12"
  Closure Type:  Peel & Seal
  Closure Side:  Open End
  Print/Message:  First Class Mail
     Physical Characteristics 
  Color:  White
  Material:  Tyvek