Fit Cuffs – Rehab (V3.1 or V2.1) is a state-of-the-art Training System exclusively developed for Blood Flow Restriction (BFR) Training & Exercise. Fit Cuffs works by inflating solid yet pliable cuffs by means of a sturdy pressure gauge and durable metal quick-disconnectors. The Fit Manometer is solid and designed with a rotating gauge for convenient left and right-handed use. (Leg Cuff V3.1 45-85 cm / 17.7-33.5 Inch) + Arm Cuff V3.1 20-50 cm / 7.9-18.1 Inch) OR (Leg Cuff V2.1 45-85 cm / 17.7-33.5 Inch) + Arm Cuff V2.1 20-46 cm / 7.9-18.1 Inch). One-Size-Fits-All.