It uses a fluid resistance unit much like some of the others on the market, and provides a good feel (and a more than satisfactory workout) without too much noise. But for Jet Black, simply using a fluid resistance wasn't enough. They wanted to lay claim to owning the quietest trainer on the market. So they went a step further, and revamped the roller itself. Instead of using the traditional large aluminum barrel to contact your tire, they swapped out for a small piece of bright orange plastic. That change of material, and the change to a smaller-diameter roller, both contribute to a quieter machine. And boy is it ever quiet! The Jet Black trainer is generally quieter in operation than the sound of your chain running through the gears. For more info, check out the full review.