What does the SL stand for? Super Light. And, Avid's Speed Dial SL Brake Levers are the top choice for racers and weight-conscious riders looking for powerful, comfortable levers in the lightest package possible. The magnesium lever bodies make these levers super tough and feathery. And, by turning the Speed Dial knobs, you can precisely tune the feel of your brakes any time without tools. The reach is adjustable, too, and these levers are also designed to bend rather than break should you crash.