A strap or tubing intended to be wrapped around a patient's limb (arm or leg) and manually tightened to reduce blood circulation to or from the portion of the limb distal to where the device is applied. It is typically used by emergency medical services (EMS) for emergency blood loss prevention or for routine blood sampling. It will typically have a fastening mechanism (e.g., Velcro or a self-locking buckle) that allows adjustments to the degree of tightness. This is a reusable device.