Elbow and Knee Support, 1 piece each Black & Gray The black one was opened once to check the size, but it's unused. The gray one is unopened. I planned to use it for my knees, but they are narrow, so it will probably be for elbows unless you have slender limbs. For reference, I measured the width from the outside of the bag. Please be aware that there may be some error. Gray: Approximately 7.3cm, Black: Approximately 7cm Length for both: Approximately 21.5cm Thank you for looking.