ProCare® Elbow Support, Extra Small, 1 Each Patient Chairs 7 milligrams zinc (as zinc Jobst Relief 20 30 Knee Hi 7 milligrams zinc (as zinc oxide) 19 1 2 x 11 7 8 (Interior Tank Size) * A compact design makes this model ideal for clinical use accomodating sheets up to 19 x 11 * Compact and rugged it also features a stainless steel housing trimmed in black with an insulated stainless steel hinged cover * Variable temperature thermostat maintains water at controlled temperatures between 150oF and 190oF * As in the 1501 the drain system and valve are 100% brass and both models also have an integral digital thermometer for easy monitoring of water temperature * Grounded hospital grade plug and high heat safety switch * Extra small fits 8 to 9 inch forearm circumference 8 inch long elbow support combines soothing warmth of neoprene elbow sleeve with a counterforce strap that restricts full extension of muscles and tendons