Shimano's Deore CS-M7200 12-speed MTB cassette is built around a mixed-material construction: the largest cog uses alloy for weight savings while the remaining cogs use steel for durability and shifting performance. HYPERGLIDE+ optimized tooth profiles deliver fast, smooth shifting even under load. What Our Gearhead(R) Experts Are Saying:"HYPERGLIDE+ keeps the shifts fast and clean even when the chain is loaded on a steep climb. The 10-51T range covers everything from technical singletrack to long fire road grinds without running out of gear."