●Made of memory foam: The material fits gently on your ears and is resistant to pain even after long periods of use ●[High Sound Insulation]: High sound insulation and reduces sound leakage ●Compatible Earbuds: Compatible with earphones with joint diameter 0.2 - 0.2 inch (5.5 - 6 mm) ●[ M ] The diameter of the ear bud is about 12.6mm ●6 Month Warranty: Free replacement for defective goods and refund. Please feel free to contact us. Please use the Amazon Contact Form to inquire