Sleevie Wonder (est. 2008) BOX SET outer sleeves variety pack x6! 4mil above average thickness (except 3mil medium). Polyethylene plastic, no flap. x2 SMALL, x2 MEDIUM, x3 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.