EpicureanKitchen Series Cutting Board, 17.5-Inch × 13-Inch, Slate

Are the particle issues coming from the cutting boards just from the slate (black) cutting boards or also an issue with the natural cutting boards?

Are these nontoxic cutting boards, no bpa, etc? Thanks!

Does this board have the rubber corners to keep the board from slipping on the counter?

Is the surface hard enough to dull a high-quality blade?