316 A4 stainless steel genuine DOT brand snap fasteners. 
Features and Benefits:
• High Molybdenum content results in superior corrosive resistance, even in the most severe environments
• Ideal for salt water conditions
• Resists pitting and crevice corrosion when subjected to chloride environments and other harsh chemicals and cleaners
• Austenitic structure gives the components excellent toughness, even down to cryogenic temperatures
• Heavy duty 316 grade stainless steel raw material used in all components