If you are looking to upgrade to the Justice League double lenti then you need to join the Justice League lenti GB AS WELL as this one either here or here.
This is purely an upgrade GB for the running GB's here and here. If you are not involved in those do not join this as you will receive nothing.
Justice League (double lenti upgrade)
This is purely an upgrade GB for the running GB's here and here. If you are not involved in those do not join this as you will receive nothing.
Justice League (double lenti upgrade)