I've been watching the US pro billiards series 10 ball and they have been talking about 1 piece slate but on the Predator site it says 3 piece 25mm. I also misread it earlier as it says 4.25" corner and 4.5" side pockets. I believe other manufacturers are using 1" (25.4mm) 1 piece or 30mm 3 piece.
Well Predator got back to me . They will only be available in 3 piece slate and only one size option for pockets. Their 3 piece slate is slightly thinner than most 3 piece slates 25mm compared to 30mm
They didnt answer my question on what materials were used in the aprons and top.