Primos Power Crystal Call Primos has been trusted by individuals for decades. Products that are made of quality material and designed to withstand the toughest environments. Trust the Brand that others in the field use and don't settle for less. Quality materials used for all primos products 100 percent designed and tested for the toughest situations and environments Crystal surface is super-hard, creating calls that peak at 15,000 Hz Includes hardwood striker Includes conditioning pad and super abrasive sandpaper