This marble enhancement set is intended to be purchased as an addition/upsell to the Mighty Marble Cock Ring, which already comes with one medium weighted steel ball.

NOTE: These are not Ben-Wa balls or Vaginal exercisers!

To use, insert a marble or any combination of marbles that will fit in the sleeve of the Mighty Marble Cock Ring. The addition of a marble is supposed to further enhance the friction and sensation of the sleeve's nubs, which, when properly positioned, can rub against all sorts of erogenous zones on the partner's genitalia during intercourse. Should a marble be either too small or too large, this kit provides a variety of sizes and weights to play around with until you find the perfect combination.

The package includes 6 marbles: 3 of which are weighted, smooth, steel marbles (no mention on if they are 100% stainless steel on the packaging) that range from 0.1 ounces for the smallest to 1.2 ounces for the largest. The other 3 "marbles" are nothing more than smooth, round, acrylic black beads (there's a small pinhole through middle of each) that are all under 0.1 ounces in weight. The latter are phthalates free and latex free. Although the marbles stay mostly protected within the sleeve of the cock ring, should they come in contact with your lubricant of choice (water-based or silicone), they won't deteriorate.

The marbles are round, seamless, have a uniform texture, and only vary in diameter and weight. The diameters are: small-1/4", medium-1/2", and large-3/4". There are several combinations possible; however, the largest size can only fit by itself in the sleeve of the cock ring. Adding too many marbles may cause them to fall out during the act. You could also fit 2 small ones in the sleeve or a medium and a small.

Should fluids get on the marbles, they can be easily rinsed off under warm running water, but make sure you cover up the drain so you don't lose the small ones.

These come in a plastic and paper clamshell that includes a picture on the back of the type of cock ring you need to own to use these with. They are made in China for Zero Tolerance. The directions are pretty simple and straightforward.

I received this product to review, but unfortunately did not have the cock ring that is meant to be used with it, so I had to go back and order one of those. I will be posting a separate review of the cock ring. The question I do want to answer is, "Do these marbles really make that much of a difference in the sensation?". Well folks, if they hit the spot right, the weighted ones can provide some additional pressure against the clitoris if your partner is right on top of you during missionary sex. Any other position, and it's just another cock ring. My partner isn't even a fan of cock rings, as they are too tight on his thick cock to begin with, so we were pretty neutral on how we felt about this product. As long as you don't lose the marble that comes with the cock ring, I don't feel that this kit is a necessity.