This heavy duty set of barrel style nipple clamps are adjustable, with removable 4 ounces weights. The body of the clamp twists, to tighten or lessen the pressure. Made of heavy duty metal and tipped with rubber for grip and comfort. Measurements 5.75 inches in total length, opens up to 0.5 inch in width. Ball measures 1.18 inches in width. Materials Coated brass and rubber. Color Black. Note free collector print included!