This is a quality marine grade stainless steel (AISI 316) chain, and is ideal for marine applications or where corrosion resistance is required. Great for light applications that require corrosion resistance. The link size is 1/8" or 3mm in the metric equivalent. There is 25' of chain in a poly bag. AISI 316 stainless is a premium grade of stainless and is considered by many to be best in class. 316 stainless is corrosion resistant and very durable even in the harshest of conditions.