Tweak nipple suckers, another unique design from the Kink by Doc Johnson collection, create powerful natural suction for authentic sensations and engorgement that traditional clips can't provide. With a simple squeeze, the Tweak set fits perfectly against the skin and creates a strong seal for hands-free fun-just attach to each nipple and watch them swell through the visually stimulating sheer black material. Total Length: 1.75". Width: 1". Circumference: 4".