This is a vintage King balancer. I used to have it on a 3B. The color is a beautiful amber brown, reminiscent of amber celluloid. The sound is also tight. I don't think you'll find this for sale anywhere, so it's a collector's item! It fits any King 2B or 3B main tube. The reissued balancers that were sold a while ago were around 40,000 yen for nickel-plated and 60,000 yen for gold-plated... It's a mechanism that combines three precisely made parts, and it can be easily removed without using tools. Compared to current models, the sound is more focused and has a brighter tone. You can also enjoy the change in sound depending on how tightly it's tightened, and the engraved logo on the surface is beautiful. This is a detachable balancer.