Optimum Comfort Gel Cushion 18 x 18 x 3 Jobst Opaque Knee 15 20 mmHg The Classic III stethoscope is lactose free The Classic III stethoscope is used by students and medical professionals alike to identify listen to and study heart lung and other body sounds for physical assessment patient monitoring and diagnosis with Battery * 18 x 18 x 3 Optimum Comfort Gel Cushion (18 x 18 ) * Unique channeled gel bladder prevents gel migration in high pressure areas * Gel channels provide relief over the entire cushion area * Foam base provides additional support * Inner foam core has a liner to protect the integrity of the foam * High end cover with straps