Fit Cuffs – Complete Hard Case + (LOP Device). This edition comes with the Bluetooth Device developed for valid measurement of Limb Occlusion Pressure (LOP), as a convenient and valid alternative to Handheld Dopplers. Fit Cuffs is a state-of-the-art Training System exclusively developed for Blood Flow Restriction (BFR) Exercise. Fit Cuffs works by inflating solid yet pliable cuffs by means of a solid pump/pressure gauge and a solid metal quick-disconnector. (2 x Leg Cuffs V2 45-85 cm / 17.7-33.5 Inch + 2 x Arm Cuffs V2 V2 20-45 cm / 7.9-18 Inch). One-Size-Fits-All.