The product is made of steel. It can be used in water, sea and pool, it should not be left damp, it 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.