These have been recently upgraded with ALL LEATHER Optima ear muffs.  They are more durable and longer lasting.  -slim

The “Killer B is the most popular headphone made by this manufacturer, they have the new style lightweight cups with a new external strain relief on the coiled cord. They come standard with a 41 position, single volume control, a mode switch that will make them compatible with almost any detector, larger diameter, soft to the touch control knob, color coded toggle switch, and a ¼” angled plug on the end of one of the industries most durable coiled cords. Inside the phones are two 150 ohm speaker elements that are sensitive enough even to pick up the faintest of signals. The Killer B fits snugly on your head so as not to slip around, but still remains comfortable for all day hunting. They come black in color and pack a limited lifetime warranty and also come with a satisfaction money back guarantee. Yes that’s correct, if you don’t like them, pack them back up and ship them back to the manufacturer. They will gladly refund your money.