Skullcandy Cassette Headphones are loaded with a mic for your calls and big 40mm drivers for full, rich, brain-shaking sound. The Cassette"s speakers can be used in Skullcandy"s Home Brew Kit hoodies and beanies to blend into what you"re wearing. Product FeaturesMaterial: Driver: 40 mmFrequency Response: Input Connection: 3.5 mmCord Length: Weight: Recommended Use: listening on the goManufacturer Warranty: lifetime