These ingenious clamps are specially designed to tighten their grip as they are pulled downward. The ends are tipped with ribbed rubber, to help retain their grip and add to the sensation. Each weight clips easily on to the end, supplying 8 oz of pull each, for a full pound of pressure total. Measurements: Clamps are 3.5 inches long, including rings, 1.5 inches wide. Weight is 8 oz Material Metal. Color Gray.