These nipples suckers are well made and travel friendly. The fit in the palm of your hand and are easy to use. You can use the suckers alone or slide the rings over your nipples to hold them erect. They can be used in a variety of temperature play safely. If you don't re-wet the rim during multiple use then they will not stay on as well as when the rim is wet.
The most helpful critical review
Pixie Penis Pumps!
The Fashionistas Nipple Suckers looked promising, but ended up being a waste of money. The glass feels extremely fragile and if your nipples are larger than the diameter of the glass opening then these are not going to work for you. Those with smaller nipples are likely to face problems getting the rubber rings over them. These weren't worth it for us but the low price makes them worth trying for most people with an interest in this kind of play.
Worth it. These are designed to keep the perk in our perky parts, but they also give the wearer some nipple sensation during intimate times. For the cost, the way these can help us spark up a sexy camisole or piece of lingerie they are way worth it.