The Phelps AMP Pitch Black Diaphragm Elk Call features a "pitch black" latex and the results are impressive. are built off of the popular AMP frame. Pitch Black 3: Stretched tight for ear piercing location bugles as well as higher pitched cow/calf sounds. The best thing about this call is the life you get out of it. FeaturesPitch 3 replicates the high cow/herd bullPitch 1 replicates a medium cow/medium bullIntermediate latex thickness