Made frontthe latest generation of computer design and control metal cutting equipment for maximum durability All sprockets are heat treated and hand finished to meet or exceed the highest quality standards JT front sprockets are made from SCM420 steel alloy Fits Chain with a 520 pitchAdditonal Fitment:2005-2006 Kawasaki ZX600 N1/N6F Ninja (ZX-6RR) 2003-2003 Kawasaki ZX600 K1 Ninja (ZX-6RR) 2006-2006 Kawasaki ZX636 C6F/D6F Ninja (ZX-6R) 2004-2004 Kawasaki ZX600 M1 Ninja (ZX-6RR) 1998-2002 Kawasaki ZX600 G1-G2/J1-J3 Ninja (ZX-6R)2005-2005 Kawasaki ZX636 C1 Ninja (ZX-6R) 2003-2004 Kawasaki ZX636 B1-B2 Ninja (ZX-6R)