These are professional and practical earbuds, made of PVC material, safe and for long time using. Replacement for stethoscopes, light weight and easy to use, good for daily usage. They can effectively reduce the vibration, isolate the interference from external noise, give you good using feeling when using stethoscopes. Features - Color: black. - Material: PVC. - Size: 4.50X4.50X0.30cm/ 1.77X1.77X0.12inch. - The replacement are made of PVC material, safe and , can make you feel comfortable when wearing. - Softer and lightweight, featured with self-stretch deformation, very flexible to serve you long. - Aimed to reduce the vibration, isolate the interference from external noise, practical and helpful. - The replacement can help give the right diagnosis for the patients. - Perfect used for hospital or clinic doctors to use, easy for taking and let you have satisfying using feeling. Package list: 2 x Diaphragms 4 x Earplugs