Serpent S411 brass weight kit
Serpent release a set of black anodised brass weights to suit their S411 electric touring ca. Included in the kit are two 5g, one 12g and one 20g weight with the two latter are designed to fit around the centre line of the car, close to the belt. The weights are marked for easy identification and fit other brands too.
Source: Serpent [serpent.com]