motorsport vs not?

i see cobra r's and i see cobra r motorsports....the motorsports have things around the inside of the rim, what are those? are they holes cut in it? what are those things? what other differences are there? why are they more expensive? heres a link so u can see for yourselves..... thanks for your help

Normal Rims
http://www.mrbodykit.com/images/wheels/cobraRsmall.jpg

Motorsport Rims
http://www.mrbodykit.com/images/wheels/380M.jpg

k thanks, yeah that was me but u never said that...LOL, sorry