If you have decided to install a door on your C&C cage, here is a tip&trick on how to easily open and close the door without getting the cage all over the place.
Note: By default, the guinea pig cages don't have a door. Only the rabbit cages have a door by default.
The door-grids are an accessory that can be ordered separately.
Alternative option: You can use a cable tie to link the 2 door-grids (cable tie included when buying door-grids or a cage model with a double door-grid)