1,000 Pack Maxtek Premium Thick Black Color Paper CD DVD Blu-ray Disc Sleeves Envelope with Window Cut Out and Flap, 100g Heavy Weight. Maxtek Premium Paper Sleeves With 4 Inch Clear Window. Window covered by transparent film. Material: 100g Heavy Weight Paper, better quality and thicker than regular 80g paper. Affordable, easy to use. Black color inside out 1,000 pieces total. 100 pieces per pack, 10 packs.