How can you describe such a unique product?  Probably the best thumbcuffs on the market, not only are they doube locking but they have separate keyholes for each tiny swinging arm.  Thumbcuffs should not be underestimated.  They are extremely effective demobilisers, especially when used in conjunction with a pair of handcuffs.  They are finished in nickel plated steel.  No you don't get a free grape, just there for scaling.