Flextone technology uses similar soft flexible material to imitate similar soft flexible tissue found in animal's neck and mouth. It'S this concept that separates Flextone from all other game calls available to today. It'S the soft flexible material that delivers realistic tones and sounds along with the ability to flex or manipulate the material to add inflection into your calling sequence. Hard plastic calls just can't provide the accurate tones or varying inflections needed when trying to duplicate the various animals and their vocabulary. This is why Flextone game calls continues to be the hunter's preferred game call due to its realistic tones and ease of use.