These four models are just representative of what is available. Tasco products are proudly manifactured in the USA. They all meet or exceed all necessary government standards.
The Wave (model "A") was designed to enhance speech communication with the use of electronics. Noise reduction rating of 26dB. Over the head design.
Pioneer XL (model "B") adds a laminated foam head pad and low profile headband. Noise reduction rating of 25dB. Over the head design.
Contour (model "C") has a countoured headband molded from extra tough acetal resin and the laminated foam head pad for comfort. Noise reduction rating of 22dB. Over the head design.
Golden Eagle (model "D") is a cap-mounted version with two point suspension for even pressure distribution, spring stainless steel headbands for long life and convenient stand-off and storage positions, plus tension adjust feature. Noise reduction rate of 26dB. Cap mounted design.