These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way. just NOT in retail packaging.

SHIMANO XT BL-M8100 BR-M8120 4-Piston Caliper DISC BRAKE
Shimano's XT M8120 brakes will provide you with the power and consistent performance to confidently charge down any trail. The new generation of XT brakes feature a re-located handlebar clamp which increases stiffness and reduces flex under heavy braking. The brake also features an updated lever shape with a taller and flatter profile compared to the previous generation brake. The XT BR-M8120 features a 4-piston caliper making it ideal for aggressive trail and enduro riding.

FEATURES
Model number: BL-M8100 BR-M8120
Hose length: front 900mm, rear 1600mm
All new 4-piston caliper
Adjustable reach lever to dial in the perfect fit
Ceramic pistons
10% stiffer lever body than the previous generation
Updated brake lever shape with a taller and flatter profile
Ice Tech pads 

Package include:
1 x Brake set (Front:900mm, Rear: 1600mm)

 

SHIMANO XT BL-BR-M8100 2-Piston Caliper DISC BRAKE

Hose length: front 800mm, rear 1600mm
Type: ICE Resin
Brake pads: J03A
Direction: Left Front Right Back
Pistons: 2 pistons
 
Features:

    Stable brake performance for consistent, predictable and powerful braking in various conditions
    High power and controllable braking for all MTB riding styles
    One way bleeding technology for easy maintenance
    Compatible with multiple pad types Resin/Metal/Fin Resin/Fin Metal
    Tool-free and easy adjustments for pad contact and Lever reach
    Sleek, durable and clean master cylinder design with I-SPEC II
    Servo Wave modulated levers offer high power and short lever stroke
    Ceramic pistons for maximum heat insulation


Package include:
1 x Brake set (Front: 800mm, Rear: 1600mm)