Brake levers34
Levers need to fit on your handlebars: obvious, but road handlebars are shaped differently and have a wider tube diameter than city or MTB bars!
Levers for MTB brakes also pull more cable than road levers, because of the different leverage requirements of V-brakes. You'll need to use MTB-pull levers with v-brakes and most disc brakes, and road-pull levers with sidepull caliper, cantilever, and road-disc brakes.
Other than that, get something cute and comfortable. You'll be touching and looking at the brake levers quite a lot!
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