... motorcycle Material:pure or alloy titanium Titanium Chainring Fixing Bolts a, Bolt sizes:M3-M22*length5mm~ ... are manufactured as ASTM , AMS and others . - As the certifications about , ISO 90012000 , GB/T 19001∼ 2000 ... of titanium,aluminium, Copper, stainless steel.3,the products can be in different colors and with ... our customers that we will replace the materials for the same at our cost or refund if ...