Seduce Me nipple suckers. Fits all nipple sizes.Hands free nipple teasing.Powerful vibration.Squeeze bulb, place over nipple, then release. Waterproof Materials: Silicone bulb with ABS bullet Size: Overall length: 2 inch, Width: 2 inch, Height: 3 inch 4 LR754 batteries included (2 in each nipple sucker) 4 Extra batteries also included.