Shell: The shell is made from a Nylon Composite Material

the Boostinator allows non-Boost wheels to be mounted in Boost frames and forks while allowing brakes and derailleurs to function as designed

Materials: Shimano doesn't list the materials used

Pros:  Fantastic quality

Microshift Advent SL-M8195-R XPress 9 Speed Rear Shifter - 22.2mm Bar Clamp - 9 Speed PLP|EMTB Optimised Shell: The shell is madeFor once the bike industry has given us something we've been asking for A wide range group set that you don't need to mortgage your house or sell your last kidney for. Introducing Microshift's Advent 1 x 9 group set with a wide range cassette, clutch mech, and matching shifter. YAAASSSSS! Best thing of all this group set will leave enough money in your pocket for a ride trip this weekend! Don't let the tiny price tag of the Microshift Advent SL M8195