Up for sale is MIKA METALS 2018 CRF450R Honda REAR SPROCKET ALUMINIUM 49T-520 HON. The vendor part number is 20-1149. Please read the title to know what is for sale Made of high quality aluminum to withstand the rigors of off road racing Designed to be lightweight but durable for even the worst conditions Self cleaning grooves make for long lasting sprocket life Tooth design allows for increased power transfer Extensively tested by top professionals