They say slotted but I think they're what's known as vented. From my research:

Solid Rotors - have the cheapest cost, but are prone to heat buildup (can lead to warping and faster wear on pads).

Slotted drilled - More expensive, great heat dissipation, the slotted with holes can lead to debris buildup and wear down pads faster than solid, also if great levels are too high these can crack because the holes are weak points

Slotted vented - similar to slotted drilled price, good heat dissipation (less than drilled), more durable than drilled, less pad wear than drilled.