JT Sprockets Steel Rear Sprocket Honda CR 125 1983 - 2007 CR 250 1984 - 07 CR 500 84 - 2001 CRF 250 R 2004 - 2023 CRF 450 R 2002 - 23 Beta RR Enduro 2013 - 2021, 48T

JT Sprockets is the world's leading manufacturer of aftermarket sprockets, constantly raising the industry's standards for quality and service. JT Steel Sprockets are manufactured using only the finest grade of C49 high carbon steel for the rear sprockets

http://www.jtsprockets.com/catalogue/part/JTR210SC/