The "Adjustable Nipple Clamps Black" are bondage/sensual play accessories that are applied to the nipples to exert pressure, which can be adjusted to be mild or more intense, depending on preference. They are usually metallic, painted or coated black, with the ability to adjust the intensity (e.g., with a screw or "barrel"), with or without protective rods (rubber tips) for greater comfort. Some models are connected to each other with a chain or have a common point (e.g., O-ring) to join them together or to add weights.