The Sinclair Institute has a motto: 'Healthy Pleasure. Healthy Play.' Yvonne K. Fulbright, PhD, MSEd states: "Intimacy products are a wonderful and effective way for a couple and individuals to explore their sexual response while adding to their sexual repertoire. Variety, novelty and endless fun are amongst the many benefits to be realized as lovers enhance their sexual lives, maximize their arousal quotient, and connect in whole new ways." To that end the Onyx is amazingly effective.

The Onyx arrives in a thoughtfully designed white cardboard box with silver writing detailing the name of the toy, the motto of the company and the Sinclair Institute logo. In a lovely curved cutout the toy is clearly visible and makes a stunning statement. Care instructions are printed on the bottom of the box and the user is reminded to wash the toy after each use with anti-bacterial soap and water, pat dry with a towel and air dry completely. The user is also reminded to use a generous supply of lube and to not use the toy if it is cracked or broken.

The Onyx is a CyberGlass prostate wand that is as perfect for men as it is for women, making this an amazing toy for couples. It is a small, unobtrusive toy that is breathtakingly smooth and beautiful. It is completely opaque, onyx colored glass with beautiful vine like etchings along the sides.
The Onyx measures approximately 8 inches if measured along the top of the curve. The curve is pronounced and makes it fairly certain that this won't be a toy that will disappear on you if it is used anally, regardless of which end you prefer. Reasonable care is still warranted as with any anal toy.

This is a slender toy, the non-rounded end only measures 3 inches around while the rounded "handle" is a larger, nearly 4 inches around. It weighs in at 10.5 ounces making it a substantial toy, that won't cause wrist fatigue.

The slender end of the wand is insertable up to about 4 inches. On the inside of the curve there are 3 raised lines for extra stimulation to the prostate. The slender wand portion ends in a bulge that is easy to insert for even novice anal players and the space between the first bulge and the second is just enough to allow the anus to hold onto the toy. There is a slender straight area behind the second bulge that gracefully but rather abruptly flares out to a ball which forms the handle of the toy.

The toy is so smooth that a tiny amount of lube makes insertion easy and comfortable. This is a glass toy that is compatible with any type of lube. It will conduct heat and cold equally well yet warms quickly to body temperature. It is designed to be ultra hygienic, nonporous, and phthalates free.

The Onyx is very easy to care for, it can be boiled or placed in the top rack of your dishwasher without soap.

This toy is waterproof but care should be taken when using the Onyx in the shower as it becomes incredible slick with lubricant and it would be a shame to drop and possibly break this toy.

Did I mention that this is a beautiful toy? It is a STUNNINGLY beautiful toy! I was instantly smitten with it even though I got it for whichever guy was willing to try it.

Arch was willing but, though it did massage his prostate, he wasn't too thrilled with the experience. For him, it was too much stimulation and proved to be painful rather than pleasurable. It did do exactly what the toy was designed to do, however, and for a guy who likes this sort of play, it would be amazing. Keep in mind that this toy is much more slender and graceful than it appears online though it isn't tiny, it won't give that stretched feeling so many guys crave.

After Arch decided that he didn't want to keep this toy, and after some careful cleaning I decided to try it. It's too beautiful to sit in a drawer! I found the slender wand side to be perfect for g spot stimulation. It's not angled quite as pronouncedly as more traditional G spot toys but it hit my spot easily and with amazing results. The blunt tip was perfect for adding tons of pressure without pain and the handle fits my hand perfectly. It was easy to maneuver and was just what I have been looking for! Paired with a bullet, for clitoral stimulation, this toy is MIND BLOWING...and gorgeous; let's not forget gorgeous!

I am very new at anal play and this is a slender enough toy that it feels great inserted, though I am certain I will quickly out grow even the bulbed end quickly.

The handle feels lovely for vigorous thrusting and is curved just so that it doesn't strike the cervix causing pain or bruising. I was able to easily reach my A spot without bothering my cervix.
It is also a great double penetration type dildo as it's not overly large, the rounded curve of the toy made for a different sensation for my partner that he found most enjoyable.

It makes a great kegel exerciser as well!

I love this dildo for it's heft, cool glass temperature, and the fact that it is so pretty! I have gotten Sigel to try it and while he says it does indeed stimulate the prostate he isn't all that interested in a non filling plug. Suits me just fine because as a g spot stimulator it ROCKS! I haven't seen any signs of wear and tear on this toy and the etchings look as beautiful as they did the day I opened the box.