If you mean Steady Betty pressing board, I have two . . .one small I keep in my bag for classes. They do help prevent stretching blocks with biased edges from stretching out of shape when pressing. I also have a pair of the Steady Betty bands for FMQ . . .they're just ok. If you really do mean pressing sheet, I've not heard of them . . .how do they differ from a teflon sheet or a piece of batiste?