Axia MD | J'z 1st Series (1999) - Multi Packs
The Axia J'z 1st Series discs in addition to being released as single discs in 1999 were also available in packs of 5 or this 10 pack storage box. In both cases (no pun intended) the discs were still the individually wrapped singles. Two of each colour in the case of this 10 pack.
See Ishii's original pictorial here for more details on the individual discs.