Gem Stone King20.00 Ct Gorgeous Oval and Round 7 Inch Sparkling Cubic Zirconia CZ Tennis Bracelet For Women

The title says 7 inches, but in the product specs it says 20.3 cm. That is not the same. What is the true length?

Is it smooth are will it catch on clothing.

I read everything there was to read unless I missed it it doesn't say that these are sterling silver?

What kind of metal is it? I have a nickel alergy.