The product is made of steel. Water - can be used in the sea and pool - should not be left damp - should be rinsed and dried. The skin acidity rate must be suitable for steel use. In case of skin with high acidity, the palm of the hand sweats a lot, which may damage the product. People whose acidity is within normal limits do not experience such a problem. Produced in standard sizes. It has an extension as seen in the photos.