These square envelopes are 130 mm x 130 mm (= 13 cm x 13 cm). The cd cardboard wallet have an outer dimension of 125 mm x 125 mm (= 12.5 cm x 12.5 cm).
The paper is a little harder than in the smooth envelopes. It crackles slightly to the touch.
You are of course suitable for mailing.
Consultation and inquiries: Phone +49 30 - 4987 6688 or e-mail firstname.lastname@example.org