Jet Black R1 Rollers The JetBlack Z1 PRO Fluid is an award winning trainer and like all JetBlack trainers, comes with a lifetime warranty. Folds into compact shape for easy storage and transport. Lowest profile of any trainer Multiple coaching sessions crafted by Olympic cycle coach Murray Healey Test and monitor yourself with an in built Fitness/Zone test and Training Zone calculator Upload your session to Training Peaks and Strava Rock-solid design is stable for the most punishing of training sessions