Primos Hyper Lip Single with Tone Converter 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 Open single-reed achieves higher pitch of cows and calves Tone Converter produces mellow and softer tones so important for calling in those call-shy bulls