They're white envelopes. They have a security lining. Nothing exciting there. What I liked about them, however, was that they seem to be made from a slightly lighter weight paper than the last envelopes I bought. Why is that a good thing, you ask? I'll tell you! It's because, at least in my case, they go through my printer easier and with less (or no) wrinkling as compared to the last box of envelopes I bought. Otherwise, they're just plain, basic, #10 white security envelopesbut good quality!