Titanium provides at least 3 times the durability and longevity of aluminum rings, This results in more time riding, less time replacing parts, and less waste Machined in San Diego, CA SRAM 3-bolt Direct Mount fitment with 3mm offset for Boost chainlines Works with both SRAM and Shimano 12 speed chains Weight: TECH SPECS ring type single (anti-chain drop) mount 3-bolt DM 3mm offset teeth 30t oval/round round color raw/silver