This is a Medela breast pump set. It's a convenient set with a variety of flange sizes, ready to use immediately. [Set Contents] *Everything in the photo is included - Breast pump unit - 2 feeding bottles - Flanges: 24mm, 21mm - Separately purchased flanges: 17mm, 19mm - Nipple shield (small size) - Silicone breast milk storage containers (separately purchased) - Pumping bra (black) - Valves, connectors, tubes, etc. - Caps, etc. - AC adapter - Instruction manual The 17mm and 19mm sizes are popular and sought after. It comes with a pumping bra, so your hands are free and pumping is easier. This is a used item, but there are no noticeable stains or damage, and it is in generally clean condition. Alcohol disinfected. Immediate purchase is OK.