Tombow Mono Knock Eraser Refill, 4 Pieces/Pack

is the "7 set" seven packs of four or seven in one package?

Do these create a lot of tiny bits of eraser dust? Or does the dust roll on itself to create long pieces?

Well if people who don't know would stop leaving answers I would not have to leave so many. Now will this fit the paper mate tuff stuff stick eraser ?

Will this work with Factis BM2?