it's t-bag bedding which we use for some of the buns that have respiratory problems.
It's ideal as well for urine scald as it takes the wetness away from the fur as it just soaks it up.
We get it from Lawsons Animals Feeds in Ferryhill, Durham and it use to be called t-bag bedding but now they have changed the name to shredded paper but it's actually the same stuff tea bags are made of.
http://www.lawsonanimalfeeds.co.uk/product.php?id_product=136