Bike Parts Quick

They have never been mounted on a Bike.
Flat Rate cable pull.
Developed for ball bearing disc brakes.
  These Levers will work for V-Brakes or for Cable Actuated Mechanical Disc Brakes.
These Levers will not work with Cantilever or Hydralic Brakes.

Adjustable Reach so you can fine tune them for smaller hands.
These Levers will work either as a left or as a right.
You will have to take the grip off the handlebar to install these levers.

These Levers do not need adjustable leverage, they works great right out of the box with V-Brakes,
Linear Pull, and Cable actuated Disc Brakes. 

Designed to work perfectly with BB7 and BB5 Discs.

These levers are lighter than some of the more expensive levers.

Here is a quote from the Avid Website

The squeeze of our levers is what dreams are made of (and you know which dreams we’re talking about). Most of our levers can be swapped to be run either front or rear, which is convenient if you like to your brakes reversed, and a Godsend if you bust a lever in the middle of the woods. Avid levers are easy to install, simple to set up, and a pleasure to pull.