The Protty wide Difference ----Protty--------------------------- Anti-rolling feet → Yes (2 convex areas in a circle) Outer Diameter → Same Diameter as Optical Disc Stand Storage → Not suitable For use alone ----Protty wide------------------------ Anti-roll feet → None (round) Outer diameter → convex edge that is larger than the disc. Stand Storage → Store together You've never seen before. Protective cover for recording surfaces It is a revolutionary item specifically for intermediate use, created to handle delicate optical discs with ease Plotty is a name derived from protection The concept is about. (*^^) Spindle case buddy Protty winner of the Good Design and Small Business Administrative Award for 2008 Brand 叶精工(Kanou Seiko) Color wht Item Weight 12 ounces Manufacturer 叶精工(Kanou Seiko) Item model number PWB20D-P Product Dimensions 5.04 x 2.28 x 5.63 inches Item Dimensions LxWxH 5.04 x 2.28 x 5.63 inches