I saw them....didn't recognize the brand though. I've seen drilled and I've seen slotted, but why the need for drilled & slotted?

I wonder what the specifications are for heat, stopping, noise and failure.....
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Ohio Plate (rear only): BOBS SLY
Sly/Ebony -- 107796
- Everything except OnStar Purchase date: 28 Jan 06
- Currently 18766 Miles - 10 Oct 08
Mods - Painted rotors & calipers, whip antenna, Custom Windrestrictor w/switch, GM CAI, floormats, door lock/unlock buttons, mud flaps, GXP door sills. New differential at 10882 miles.