With the device, it will be locked until you decide to release them. The sturdy cage is ergonomically designed, adjustable and lockable. Hypoallergenic cage is sturdy, The three sizes are available according to the inner diameter of the clamping ring and are suitable for most people. Material Real stainless steel. No chrome plating, no nickel plating. Simply sanded, more comfortable and completely safe. Size 3 sizes can be selected according to the inner diameter of the clamping ring To avoid injury or exacerbate existing conditions, this product should not be used on areas that are bruised, swollen or inflamed, including skin lacerations. If irritation or discomfort occurs, stop using it immediately. Cleaning: Clean with a mild soap and a soft brush (toothbrush).