I think they're the basic ones, no resistance, 2 rear rollers, 1 front, fold up. I bought them about 2 years ago following a training clinic where we used those belonging to the shop. I so rarely train indoors that it doesn't seem worth keeping them.
Check your PM's, bro - I'm interested. <If you're gonna be dumb, you gotta be tough> Get Fitter! Proud member of the Smartasscrew, MONSTER CLUB Get your FIX today?