brand new and high quality Features: Made of high-quality steel material with durable and tear-resistant characteristics, offering long life. Durable and lightweight, easy to install. Compatible with most rear derailleurs on the market, supports 8-12 speed. Bicycle wheel with fully sealed bearing for center bolt derailleurs. Pulley for jockey wheel only; other accessories shown in the picture are not included. Specifications: Compatible Models: Shimano-compatible, SRAM, etc. Compatible Speed: 11T (8-speed, 9-speed, 10-speed, 11-speed), 12T (10-speed, 11-speed, 12-speed) Material: Steel Optional Size: 11T, 12T 11T Size: Length: approx. 4.1cm/1.61in, Thickness: approx. 0.81cm/0.32in 12T Size: Length: approx. 5cm/1.97in, Thickness: approx. 0.83cm/0.33in Color: Black Optional Teeth: 11T, 12T Optional Style: A, B, C, D, E Quantity: 1 Pair Note: No retail packaging. Please allow 0-1cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you. Package includes: 1 Pair x Pulley for Jockey Wheels