High strength, 3,600 gauss, bipole neodymium magnets for convenient under the sink treatment of drinking, washing, or shower water. Patented, concave design fits snugly over any small diameter (ie, 0.5") copper or plastic water pipe line. Each 1.3" x 2.3" x 0.85" half includes a 0.3" wide clamping edge. The two halves are securely held on by their own powerful magnetic attraction - north is on one side, south is on the other. Most popular model.