Cassettes for 11 Speed Microshift. Shimano and SRAM spacing (Campagnolo 11 speed is so close it will work with that too).
Road cassettes are made from steel sprockets no alloy carrier. Last 8 sprockets are riveted together. first three are loose. The road cassette requires an 11 speed road freehub.
The 11-40T cassette has the first two sprockets loose and the last 9 riveted together. the largest sprocket is made from aluminium alloy and is riveted to the next sprocket down to save weight. this MTB cassettes fits a 11 speed road freehub with a 1.85mm spacer or a 8/9/10 speed MTB freehub.
Chrome Plated Sprockets