The tacx booster ultra high power folding magnetic trainer is a sturdy cycle trainer which generates pure power even at low speeds thanks to the advanced magnetic brake the integrated braking system on this tacx turbo trainer consists of two discs with 8 permanent magnets each and a 2kg flywheel the trainer can reach a maximum resistance of no less than 1050 watts the booster is simply safe and easy to assemble as the brake has been built in to prevent the rider from contact with the hot fly