Specifications: We are pleased to introduce you our world wide patented b box. The outlook of b box is the same as the normal CD case, but when you want to pile up the disc cases, just simply turn up the patented device at its left edge of the b box and pile it up on the top of each other. When you want to take out an individual CD album after piling up, all you have to do is to drawn case's inner panel by sliding it out. The outlook of b box is the same as the normal CD case, but when you want to pile up the disc cases, just simply turn up the patented device at its left edge of the b box and pile it up on the top of each other.