Has the advantages of both drilled & slotted rotors
Allows the disc to expand and contract and prevents the disc from cracking or warping
Increasing cooling area and retains more friction surface
Slots relieves thermal stress
Slots are self cleaning and the pad build up will not clog the slots and are exhausted via the rotor edge keeping the disc surface clean
Reduces brake pad dust buildup and keeps the wheel clean through vacuum effect

Disadvantages:

Cost more to produce

Remarks:

Patented design (US Patent #: 7097007)
This design optimizes the friction between the pads and disc surface and achieves the highest level of braking performance that no other designs can provide.
Minimal brake dust build up on wheels

rb 2 piece rotor

Open Slot

Slotted Only

Drilled & Slotted

Slotted Only

Advantages:

Helps the gas to escape
Keeps disc surface cleaner
Easy to produce

Disadvantages:

Debris builds up and clogs the slot

Remarks:

Preferred by track racers because slotted rotors are less likely to crack than cross-drilled rotors.

Open Slot

Slotted Only

Drilled & Slotted

Drilled or Drilled & Slotted

See detail view

Advantages:

Provides better cooling and pad bite
Gives "racer's" look

Disadvantages:

Reduces friction surface
Pads wear out faster
Cracks tend to form around drilled holes under hard braking or track racing

Remarks:

Rotors with drilled holes should only be used for street driving, as these rotors may tend to crack under repeated hard braking or in track racing. When choosing a drilled rotor, be sure that you do NOT choose a rotor that was drilled from an aftermarket blank (like many rotors on the market), as these rotors will not be balanced. All RacingBrake rotors are dynamically balanced as their last step, after slotting and/or drilling to ensure even distribution of mass.

Disk Surface Finish

Open Slot*

Slotted Only

Drilled or Drilled & Slotted See detail view

Drilled or Drilled & Slotted

See detail view