gotta question regarding rims that are gonna go on my car. i know my offset and everything but this threw me for a loop... jaydm gave me this options list for rota slipstreams- 15-6.5"+40mm offset 4x100,5x100,5x14.3

the last part confusues me. im prolly overanalyzing this but dont want to talk it out with some dumbass sales rep over the phone.help would be appreciated as im going to try to order these tomorrow