Sleevie Wonder (est. 2008) BOX SET outer sleeves variety pack x12! 4mil above average thickness Polyethylene plastic, no flap. x2 SMALL, x2 MEDIUM (3mil), x4 LARGE, x2 XL, x2 XXL. Protects from dust, dirty hands, oily fingertips, shelf wear, & minor impact + abrasions. Also preserves shrink wrap. Acid & lignin free, archival safe. Orders go out within 24 hours, USPS (worldwide).