Rockys Mini Master Diaphragm Call Number 103A - The Mini Master Single has a narrower frame to fit smaller roofed mouths. The tape is trimmed to fit more comfortably in your mouth. Single latex produces high-pitched bull sounds and young cowithcalf mews, chirps, etc.This call was designed and invented by Rockie Jacobsen, owner of Bugling Bull Game Call LLC. It features an unique "Tone Top" that is correctly designed to create sounds accurately with ease and realism. The "Tone Top" sits in the roof of your mouth with more comfort and quick positioning to obtain all the elk sounds. It is designed to be placed further forward in your mouth. This helps to prevent gagging and gives you easier control of the latex with your tongue. Tone Top DiaphragmSingle .004 latexNarrow frame and tape for youth, women and men with small palate area