Halifax, gateway to Atlantic Canada Frontier Canada Montral, Qubec Postal Code Forward Sortation Areas Map zip code map HX Halifax Postcode Area Post towns, districts and councils Geopunk zip codes map zip codes map. MTX OE Steel sprockets are strong and durable, heat treated and hand finished for longevity. Front sprockets are constructed from SCM420 chromoly steel alloy where rear sprockets are constructed from C45 high carbon steel with a Zinc electroplated finish. Designed as an OEM replacement to exceed OEM specifications at a fraction of the price, making them your ideal cost effective solution for replacing old worn and warped sprockets. OEM replacement Exceeds OEM specifications Heat treated and hand finished Pitch: 420 Teeth: 47