I bought what looks like the same pair sergio has
here.
I just got them in the mail today and they came with a nice hard case, a cleaning cloth, and a string so you they can hang around the neck. They are fit overs and fit my glasses fairly well.
Specs:10,600nm - OD 7+
9000-11,000nm - OD 5+
130-360nm OD 9+
They are made specifically to cover all the wavelengths for co2 lasers.
Price ins't too bad either $37.50 then I paid around $10 for shipping. They also have a really easy paypal checkout.