The 31 discs are made up of 4 digipaks, all housed in a special limited edition collector's box:
Wrestlemania 1 - 5 (1985 - 1989)
Wrestlemania 6 - 11 (1990 - 1995)
Wrestlemania 12 - 17 (1996 - 2001)
Wrestlemania 18 - 21 (2002 - 2005)
This boxset also includes 4 Free Limited Edition Senitypes.