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I believe they are called Durablock or something close.
I've seen others use all sorts of home made or found objects from 2x4s to foam pool noodles. All depends on the contours that is being worked on at the time.
Dura blocks seem to be the consensus. In the meantime I found a molded rubber grout float in my tile toolbox that holds half a sheet of paper and is working ok. I have to staple the paper around the end.