Most cages used for sugar gliders will have 1/2" bar spacing all around. This is acceptable for climbing on but isnt much for the animals to stand on or perch comfortably.
I recommend laying 1/2" or even 1/4" mesh cloth on the floors of the cage. This gives more surface area for them to rest their weight on yet it still allows most things to fall through.
All you need to do is cute the mesh to size and fasten it with four or so tie wraps.
If you happen to have one of the typical Tower Cages
that are preferred in our community, then you have the ability to also build a second floor for the animals with mesh too. This give double the floor space for perching, exploring or placing objects, and it makes the occupants happy. A cage can never have too many hides, pouches, shelves and things to explore and stimulate.