ALTER MIDNIGHT SERIES COG
Material : Aluminum alloy (7075/T6)
Thread : 1.37"x24 TPI
Chain width : 1/8"
Tooth Count : 15T.16T.17T.18T.19T
Weight: 15T=21g / 16T=25g / 17T=29.2g / 18T=34g / 19T=38.2g
Color : Black / Purple
Compatible with most track hubs in the world.
Made in Taiwan
