Features:Good stability: The uniformly distributed tension greatly increases the stability of the mask. Wearing it correctly will reduce air leakage and noise. Smooth surface: It can be cleaned repeatedly without abrasion, curling and falling off. The non-suturing process has a smoother contact surface to avoid abrasions or irritation to the skin. Relieve stress: comfortable, soft, non-irritating odor, can be used at ease.Universal: Reduce the squeeze marks of silicone masks, compatible with most masks. Reusable: It can be washed repeatedly, it is not easy to wear, and it is comfortable to wear. Package Includes:4x CPAP Mask Liners Specifications:Material: CottonColor: Blue/GrayDiameter: Approx. 5cm/ 1.97inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.