This 925 Sterling silver 3.76mm Archor Curb chain specification.:
these are only two chain, just to shoe example of the chain sizes, and weight
 
This product only only comes with a Pouch (bag), a box is extra!!
 
Chain 40-41cm/16inch specification
Length.: 40-41cm
Gauge.: 3.76mm
Weight.: 9.05g
Alloy.: S
 
Chain  75-76cm/30inch specification
Length.: 75cm
Gauge.: 3.76mm
Weight.: 16.75g
Alloy.: S