These are Shimano new Claris shifter/brake lever combo for flat bars. The work with a double chainset and any of shimano's 5/6/7/8/9 speed front and rear mechs. These will be commonly used on hybrids but can be used on any flat bar with a 22.2mm diameter where the shifter clamps. Older MTB's that use cantilever brakes will benefit from these.
The brake levers will work with ay cantilever brake, caliper brake (single pivot or dual pivot), centre pull brakes, mini V-brakes or disc brakes designed for drop bar brake levers like the Avid BB5 or 7 road. These brake levers are NOT to be used with standard V-brakes or disc brakes designed for flat bar brake levers and the cable pull these brakes require is imcomaplatible with the Claris shifters.
If you are unsure please ask me as a informed buyer is a happy buyer!