What is gold and silver "Good Delivery bars"?

"Good Delivery Bars" is the internationally accepted trading standard used by gold dealers, traders and bullion banks around the world to trade and deal in gold and silver.  

Specifications for Good Delivery Bars :

Each bar is marked with the fineness, the year of production, the serial number and the refiner's assay stamp .

GOLD : Minimum gold content > 350 troy ounces (≈10.9 kg)
Maximum gold content > 430 troy ounces (≈13.4 kg) 

SILVER : Minimum silver content > 750 troy ounces (≈23 kg)
Maximum silver content > 1100 troy ounces (≈34 kg) 

Only refiners whose bars meet the stringent standards set by the LBMA for global OTC trading are included in the Good Delivery List.

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