I found this
In 1994, the aim was the world's lightest aluminum wheels, developed jointly with Desmond Corporation, it took two years to achieve the weight of 3.88kg. The SW388 was introduced in 1996 but production ended in 1999 with the closing of the Russian forging factory. The SW388 has been an iconic symbol of Spoon with Honda fans all over the world demanding it's re-release. After careful study the wheels are machine forged by Tan-Ei-Sya in Toyama prefecture Japan. As with the original, the finish is anodized aluminum black which is lighter and stronger than paint.