The Sound Plate? automatically positions the call at precisely the right angle making calling easier. The Hyper Plate? Double has 2 reeds with a ?Y? cut in the second reed which is perfect for hyper estrus cow talk and heard bull bugles. - Two thin latex reeds with ?Y? cut in bottom reed - 30ยบ angle of Sound Plate - Reproduce Estrus? cow and raspy herd bull sounds