The exceptional whiteness of Tyvek® enhances graphic images. Tyvek® cd envelopes have a higher strength-to-weight ratio than paper and other cd sleeve materials. It's not only significantly lighter than paper, it's stronger. Tyvek® cd sleeves are incredibly water and moisture-resistant. Our Tyvek cd sleeves hold 1 CD with a 4" round Mylar window for easy label viewing. Safe for DVD storage too! 4-7/8 x 5 inches exclusive of flap.