This is a cufflink Lego minifig upper body. If you add legs, arms and a head to it, then you have a complete Lego minifig cufflink. The best material is probably the Cream Robust, which is ABS, the same material as Lego bricks.
Metal cufflinks in the shape of the popular Fuchs wheels used by Porsche up to the late 80's for both 911 and 944 lines...
Also available in stainless steel and alumide. Stainless steel has a certain bronze tint, look at the photos from the wheel model to get an idea...
All items are made to order. This means there's a period of 2-3 weeks until delivery, depending on the material chosen.