The Mazuri pellets are very small. Some of us here in WA soak it in low sodium chicken stock. We also blend it into our diet after it is soft. We don't use it as a hard kibble. However, I know people who do use it as a dry staple and their gliders don't choke on it.
Reliable Protein Products Insectivore Fare is another recommended brand from our vet. It is something like 40% moisture so I prefer to buy the Mazuri and then add my own liquid to it. The third product is Hedeghog Diet from Pretty Pets International.
All three of these are specifically listed on the "Diet and Care Recommendations for Sugar Gliders" provided by our vet, Dr. Cathy Johnson-Delaney. I don't believe that our vet is suggesting these as a "dry staple" but more as an actual component in a diet that many exotic vets suggest.
It is suggested that any of these insectivore components are 50% of the diet and then the other 50% of the primary diet is a nectar. Dr. Johnson-Delaney suggests using the original Leadbeater's Mix.
We feed a Tbsp. of veggies (preferably dark leafy greens high in Ca) and a tsp. of fruit as a treat. Insects are considered treats in this suggested diet as well.