Features 1、Nickel Chromium Steel: Nickel chromium plated high tensile steel plate, multi layer electroplating anti rust treatment, sturdy and durable. 2、Good Performance: Deficient tooth design, smoother shifting, punching to reduce weight, high accuracy gear ratio and strong compatibility. 3、Hollow Design: 11 speed bicycle cassette adopts hollow technology which can easily reduce weight for a lighter and smoother ride. 4、Steady Rotation: The flywheel rotates smoothly and without noise, ensuring tight connection with the bicycle hub and smooth operation. 5、Applicable Model: 11‑34T 11 speed bike cassette set is suitable for road bikesand folding bikes. Exquisite workmanship, long service life. Item Type: 11 Speed Bicycle Cassetteette Material: Nickel Chromium Steel Color: As Pictures Shown Weight: Approx. 453g / 16.0oz Application: Suitable for Road Bikes Speed Ratio: 11-12-13-15-17-19-21-23-25-28-34T Package List 1 x Flywheel 2 x Tooth Piece 1 x Flywheel Cover