Reasons for Selection – Trading card mailer is crafted from thick cardboard, offering resistance to bending and tearing, protecting mail from creases and wrinkles during mailing. A strong adhesive seal prevents tampering, and the seal and tear strip design makes opening the package simple.Measurement – Color: Gray; Length: 17.8 cm / 7 inch; Width: 13 cm / 5 inch; Package Include: 100Pcs x Cardboard Mailers.Suitable for – Self-adhesive photo envelopes are suitable for safely mailing or storing flat items like art prints, photos, important documents, certificates, CDs/DVDs, books, brochures, trading cards and soft prints, which are great for post offices, logistics, mail-order, office supplies, online stores, households and individuals.