100 Black / Dark Gray CD SMART TRAYS #CDIR80DOSM - Turns any standard single 10mm Jewel Box into a DOUBLE CD Jewel Box! Holds 1 Disc on Either Side & Has a "Hinge"! Turns Any Standard 10mm CD Jewel Box into one that holds 2 Discs with it's special hinge! Can Turn a 24mm double CD case into a 4 CD case! Also, will turn any 4CD Chubby Jewel Box into a 6CD Chubby Jewel Box by replacing single outer trays with these SMART Trays!