If you're referring to a 4jin gold bar, where jin is a unit of weight commonly used in East Asia (1 jin = 0.5 kg or 1.102 lbs), a 4jin gold bar would weigh:

4 jin = 4 * 0.5 kg = 2 kg

So, the gold bar weighs 2 kilograms or 2000 grams.

If you're interested in knowing the value of such a gold bar, it would depend on the current market price of gold、Gold prices fluctuate daily, so I'd recommend checking a reliable financial news source or a gold market website for the most uptodate prices.

As of my last update, the price of gold was around $60 per gram、Therefore, a 2 kg (2000 grams) gold bar would be worth approximately:

2000 grams * $60/gram = $120,000

Please note that this is a rough estimate and actual prices may vary depending on factors like gold purity, market conditions, and location.