Strap is a general designation of the effective part of a wrist watch. A variety of strap materials, cowhide is the most common, and crocodile skin is the most precious one, alligator leather strap is also known as the leather strap in the "Platinum."
Platinum is a rare and expensive natural pure white metal, is one of the world's rarest jewelry with precious metals, the annual supply of only 5% of gold, with almost two times the strength of gold, 30 times times rarer than gold. Platinum Luster White, natural purity, purity of up to 90% above, nature, often wear will not fade. Pt900 is a platinum jewelry with a purity of 90%, and Pt950 represents a platinum jewelry of 95% purity.