Make of alloys,it have good strength,wear resistance. Can used for long terms. This key carabiner is not only a keychains,but also a alloy bottle opener,which can easily open bottles of beer and so on. Small but rEnduring,the keychains have not additional weight,makings it easy to carry. Keyring can quickly released and stay closed to key loss,metal Clip suitable for organising key and small tool. Light weight and small size,for hiking,outdoor camping,travelling or daily use.