100% brand new and high quality Gear position explanation 21 Speed, left 3 and right 7 24 Speed, left 3 and right 8 Aperture, 22.2mm Material:Aluminum Size:as picture shown,14.5cm x 10cm/5.66'' x 3.9'' (approx) Color:Black Quantity: 1 pair(2Pcs) Note: No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pair Bike Derailleurs x 1(other accessories demo in the picture is not included.)