Koss ED1TC Stereophone Ideal for schools, libraries and training departments, this stereophone incorporates a plastic ear cushion that allows easy cleaning and maximum durability in multiple user environments. The ED1TC features an adjustable headband and a dynamic element for a full frequency response. Ultra-durable, the cups and headband have been designed to fit a wide variety of head sizes - from children to adults - for everyday use. Improve cushion hygiene and avoid crumbling foam ear cushions with the Koss ED1TC.