The suction cup fits in the base of any bullet powered vibrator, just take the vibrator out and put the suction cup in the base instead. Once in place the suction cup allows you to place it on any smooth, flat surface, opening up a world of possibilities. The post you will place the your toy of choice on is a little under two inches and is 5/8 of an inch in diameter the same as a stranded bullet vibe for obvious reasons. The post has two rings on its length that help keep the suction cup firmly in the base of the toy your using it with. Although it is designed by Tantus, this accessory is compatible with any vibrator that uses a bullet in its base. Lastly, if your handy (which I am not) you can hollow out the base of other Dildos in order to make them compatible with the suction cup. Materials: Cleaning and Safety ConcernsJust like the Tantus toys, it is design to go with this suction cup is made of 100% pure silicone. Pure silicone is nonporous, hypoallergenic, and phthalates and latex free. Pure silicone is easy to clean with hot soap and water or a toy cleaning solution. Although the ability to sterilizing is not as big of a deal here as this accessory is going inside of another toy as opposed to inside of you, there no harm done in using a sterilizing method if sharing, “better safe, than sorry”. Silicone can have a possibly damaging boding reaction with silicone lubricants. While you are not going to be placing any lubricant directly on the suction cup some might still drip on to it, I would again be better safe the sorry and only use water based Lubricants when playing with this toy if you don’t want to risk damaging it (or do a test patch on it. Lastly, although it may seem obvious don’t confuse the material and safety rating of the suction cup with the material and safety rating of the toy you’re using it on, would not want to accidentally share something unsafe. Insertion of the the suction cup was easy, simply push the suction cup where the bullet vibe would go and it pops in with ease, although insertion was easier for some than it was for others. Removal is easy as well just pull with a bit of force and the suction cup pops out. To get the suction cup to stick just push it on to your desired surface with a bit of forces, to remove just pull on the lip of the suction cup to break the suction. For each of these four I surfaces, I tested each of the toys by giving them both a through “handjob” (tugging on it vigorously) and through “blowjob” (sucking on it with my mouth) to test how strong the suction is. In all cases the suction cup performed excellently. It took a lot of effort to be able to separate the base from the surface or the toy from the suction cup; more then you are likely to produce during normal use. Again, the suction cup was able to firmly stick to the desired surface while in use. Note: however that the heaviest of the toy I’ve test is the  Rascal which is(1) seven and half ounces. If and when I got any heaver toys I’ll post the results as a follow up. Firstly, you can stick the toy to some horizontal surface like a chair, exercise ball, counter top, etc. Secondly, you can stick it to a vertical surface like a wall or shower stall. Depending on how high you place it and how you position yourself, you can push yourself on to the Dildo in standing position or bent over in to more of doggie position. You can also suck on it to stimulate oral (in any position). One thing I have done with this is stick it to a mirror and then sucked on it; allowing me to see my own face as I do it. You can also stick the suction cup to the wall opposite a mirror and watch yourself ride the thing, or stick it to a mirror and look back over your solder to be  to see your own face as you ride your now Suction Cup Dildo. If you get more than one suction cup you can stick dildos to one or more surfaces and play out some group fantasies. For example, If you’re using this in a narrow space  like a shower stall you can use two suction cups to stick two dildos: one for you to be able to suck on (providing suction to something that has suction O_0) and one on the opposite side to penetrate yourself with. Or you could just alternate between to suction cup equipped Dildo and play out a group fantasy that way i. Try sticking this to a window or a full-length glass patio door and give any noisy neighbors an eye full. Try sticking this to some appliances, the refrigerator door for example. Depending on the object, you might be able to show it how much you love it with this thing. The possibilities are limited only by your imagination. This downward curve may be aesthetically unappealing to some but more importantly, if the toy slips out during use it makes it harder to reinsert as it will droop downward instead of standing firmly in place. For this reason, I would recommend using this with longer toys since there is less chance of it slipping out, especially if you are using this on the vertical surface as the angle which your penetrating it from might result in you not being able to fully go down to the base. I would also recommend using it on firm toy without much flexibility, for example, it is hard to ride the Tantus Techno because its flexibility causes it to bend when you move down on it. The two halves of the packaging snap apart easily (no risk of hurting yourself fumbling with scissors ). The two halves can be snapped back together so you could store the toy in the packaging again if you wanted to, although I don’t find it very good for storage purposes. Silicone doesn’t have any special storage requirements, although in easily attracts lint, dust and hair so you may want to store it a baggie or something for that reason. Closing ThoughtsThere is not much more to say the Tantus Suction cup works as advertised and is a must have for anyone, who has compatible toys and is looking for a new ways to play with some of their old favorites. Suction Cup Dildo