5 Star DL Window Wallet Envelope Peel and Seal 100gsm 220x110mm White (Pack of 500) 9066085 Star white DL envelopes. These envelopes have a blue opaque interior for security. They also feature a window which allows you to clearly display the address of your correspondent. Made from 100gsm paper, these envelopes are mediumweight and perfect for everyday use. This pack contains 500 envelopes. DL size (110x220mm) Made from mediumweight 100gsm paper Window size of 39x93mm Window position 19mm in from LHS, 18mm up Peel and seal closure peel