The EW3901S Large Cuff for Upper Arm Blood Pressure Monitors is for Panasonic(R) upper arm blood pressure monitor models EW-BU35W, EW-BU04W, EW3122S, EW3109W and EW3106W. It fits upper arm sizes 13-3/4" to 17-1/3" (35cm-44cm), and the cuff rotates 360 degrees and is easy to use for both left- and right-handed users.