16+18mm Squared Connecting Rings

The two rings become a unique pair, which only can be separated by breaking them apart. One to keep and the other to give. I like mine most out of Alumide, the material comes quite rough out of the printer but tends to naturally soften the edges and color a bit deeper by wearing. Mind that the coloring of Nylon is not thoroughly; it is only dipped in a colourbath: by breaking and wearing it is possible that the white material comes through. The two rings made out of Nylon have to be bent more often than the Aluminum Plastic rings. It is quicker to grab some scissors or the stanley knife.