The product is 316 L steel. The bracelet has an adjustable length between 19-24 cm. The basic size is 19 cm, 5 cm extension is available. It is not affected by pool and sea water, but should be protected from chemicals in the bathroom. The product is very durable, but its life may be shortened in careless use, but its life is long in careful use. Shipping Information For UK Orders: Your orders are prepared within 1-2 business days and shipped via Royal Mail’s 48-hour tracked service. You can track your shipment through your account. For International Orders: Your orders are prepared within 1-2 business days and shipped via Evri’s tracked service, with an estimated delivery time of 5-7 business days.