rick, as stated by others the carquest 1/2 shafts come with a ''lifetime'' warrantee. as they are re-built this is a good thing.
i would mention the market does vary for these things and you will have to return the old ones for the ''core'' charge. my core charge was $90
each side so you can see they really wanted old ones to re-build.
i've been running mine for about 10000 miles with no problems whatsoever.