This is a Medela breast pump with a 2-Phase Expression technology. It has been used, so there is some wear and tear (especially the box, which is crushed from the time of purchase), but it functions without any problems. If you need one, please consider it! There are 9 white membranes (8 in the bag, 1 attached). Product Description Below: - Brand: Medela - Model Name: Harmony - Color: Yellow - Included Accessories: Instruction manual, all parts - Features: 2-Phase Expression technology - Material: BPA-free Medela Harmony