These nipple suckers are fun to experiment with. I only tried them on my nipples, but it was fun to see how they worked and what I could change about them. I think the best use is for nipples. If you have extremely large nipples, you might have a bit of a challenge using these. I have relatively small nipples unless they're being sucked or manipulated in some way. I was able to get my full nipple inside the sucker.

I think this is a good toy for beginners to nipple play. The reason is that you can easily remove the suckers once you have had enough. Advanced users could enjoy these, as well, since they have the ability to stay on longer. I believe that the longer you have them on, the stronger the sensation will be. I found these nipple suckers can stay on for an excess of 20 minutes with no manipulation. I also bounced around a lot with them on and they did not fall off.

These are PVC, which has a safety rating of 2. With a safety rating of 2, it is important that you clean these toys if they come in contact with bodily fluids. They have a scent much like the blow-up toys you use in the pool. The scent isn't strong at all. In fact, I had to basically put my nose about an inch away before I could smell it. They are smooth, slightly slick. I like the way it feels against my skin. There are no seams on the nipple suckers. It seems they are slightly flexible... the flexibility is improved when they are warmed in a hand or against the body.

I like the way these nipple suckers look. I like the color of the pink. In the dark, it sort-of glows. They are very easy to put on and take off. All you have to do to put them on is slide them over your nipple and squeeze and they will suction to stay on the nipple. To take them off, you squeeze again and it breaks the seal against your breast.

They are not meant to be worn under clothing, unless you want it to be obvious that you have something attached to your nipples. I have them on under a thin shirt right now and they are staying on well. They are comfortable to wear. I can feel a little bit of pain around the edge, but there isn't too much pain during use.

As I stated before, I think these nipple suckers work best for small or medium sized nipples. If you have large nipples, they might work. There isn't any way to adjust the suction, but you do have the option to change the position quite easily.

This toy does not have any vibration. It is just used to create suction around the nipple. I found that they stayed on well until I squeezed them, thus breaking the suction. They are easy to put on your nipple. The only problem that I had was the suction didn't work perfectly every time. I found that it was enjoyable to put them on and then change up the suction a few times.

For safety, if you share these and they come in contact with bodily fluids, you should use a toy cleaner or an anti-bacterial soap. I store them in the original packaging.

The toy is packaged in molded plastic. It contains a double-sided insert that shows the name. This is not discreetly packaged. There are no instructions, but they are pretty self-explanatory.

I really like these nipple suckers. I like the painful sensation that my nipples have after I've worn them for a while. It reminds me of the feeling I get after having my nipples sucked. The one thing I don't like is that when I removed the sucker from my nipple, it was slightly difficult to get it to go back on during that time. So my suggestion is that you keep them on until you feel you've had enough. Don't put them on and off.