All XAM O-Ring chains are manufactured with hi-carbon alloy steel for strength and durability. XAM utilizes Nitrite Butadiene O-Rings to seal in lubrication and deliver smooth power with minimal ring drag or loss of horsepower. Chain length is 128 links. Fits: Honda CBR125R 2011-2015 XL125R 1986-1987 1989-1991 Yamaha TT225R 2002-2005 TTR225 1999-2001 XT250 2005-2007 2009-2012 2014-2021 XT350 1985-1999