The unisex M3NG3R RING consists of 3 menger sponges of the 1st iteration and a negative imprint of the 4th iteration in the band.
Minimalistic Swedish Fractal Design By Fractal Mathematics / Johan Andersson.
(This version is 21mm, which turned out to be bigger than a normal round ring - but it fits my thumb... I will make a smaller version if you send me a PM - click on "Contact" to the right -> )
The M3NG3R BRACELET in the images is not included but can be found here.