These clamps are adjustable so you can apply as much pressure as you desire (all with the simple turn of a screw). To amplify things, you can deliver some vibration with the attached bullet.

Specs: Dark Passion Vibrating Nipple Clamps

• Size: 5 inches in total length, 0.75 inches in diameter, clamp opens to approximately 0.5 inches wide
• Material: ABS plastic, vinyl, metal
• Color: Black
• Batteries: Requires (3) tab batteries, included
• Clamps are adjustable so you can apply the desired amount of pressure
• Twist the bottom of the clamp to deliver vibration to each nipple