These are resealable outersleeves for standard CD jewel boxes. They fit the CD in its jewel box to protect it from scuff and wear, and the thin line of resealable tape allows you to open and close the bag many times without losing the stickiness of the adhesive. The sleeves are 2 mil thick and measure 6-1/8" x 5-1/8" with 1-5/8" flap (156.85mm x 130.18mm with a 41.28mm flap).