For the breeding tubs, or for the egg tubs? That's plain-old vermiculite and water in the egg tubs.
The tub Maureen is sitting in has Sani-chips, which are cut aspen. Sani-chips great for regular usage---clean, low-dust, keeps odors down for a good two or three months of use, even when I'm dumping water in there to up the humidity during sheds. But I have to special order them from LLL, because nobody carries them around here.
I mostly use plain paper for actual breeding, because there's some risk of the chips getting into somebody's vents during mating and causing major problems. It's much harder to keep the tubs clean with paper, because you basically have to throw it out and clean the tub every time anybody pees.
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