Sold as a set of 2. SS size Hole size suitable for slow feeding for newborns. (Approximate feeding amount: 30-80ml) Bulk sales and individual sales are also welcome! 1 piece: 550 yen 2 pieces: 999 yen 3 pieces: 1390 yen 4 pieces: 1790 yen Please contact us in the comments if you wish to purchase. We also accept sales of 4 or more. Manufacturer's Description: Feature 1: Adoption of Latch Online Adopts "Latch Online®" (wavy line), which serves as a guide for the position of the nipple. It guides to the appropriate depth of attachment and supports smooth breastfeeding. Feature 2: Improvement of Nipple Elasticity Newly developed low-hardness silicone rubber that allows for smooth tongue movement. By adjusting the thickness, it is closer to the softness of the nipple. Feature 3: Improved Flexibility of the Nipple Base The nipple part is softer than before, allowing for a more natural latch. *When breastfeeding, please feed with the air vent valve on the side (the brim either up or down).