i want to use some conveyor belts for a project...so any suggesions how
How small is small?
A belt 2" wide would be small compared to real conveyer belts, but so would one with a width of 0.1", but they have different solutions.
People who make large scale R/C models of tanks sometimes use conveyor be4lts for tracks.
Perhaps you could go the other way round, if you can find some tank tracks that could be used for a conveyor belt - how about the size of eg. Tamiya tracks?
Some shops sell tracks in whatever lengths (in 1' increments).