Silver Technology Field Spray with Refill for Odor ControlCode Blue D-Code Field Spray uses patented Silver Scent Technology with medical grade silver nanoparticles to locate and wipe out odor before you step into the woods. This package includes a 12 oz spray bottle and a 32 oz refill. Patented Silver Scent Technology Uses medical grade silver nanoparticles Built to locate and wipe out odor Includes 12 oz spray bottle Includes 32 oz refill