1~5PCS 12T 14T 16TRear Derailleur Pulley Set Wide Narrow Tooth Guide Support 7-12s For Sram MTB Road Bike Description: Brand: FOVNO Product name: rear derailleur positive and negative gear guide wheel Material: POM weight: 12T 10g 14T 12g 16T 14g Support speed: 7~12SPD Installation aperture: 5mm Installation thickness: 8mm Features: Brand new, high quality, aluminum alloy CNC oxidation. riding, aluminum jockey wheel rear derailleur pulley 11T. Specifications: Tooth outer diameter (mm) Weight (g) Applicable to 12T 51mm 10g The longest arm 14T 59mm 12g some long arms 16T 66mm 14g very few long arms Polyoxymethylene (POM), also known as acetal or polyacetal, has the characteristics of high rigidity, low friction, and excellent dimensional stability. POM is characterized by its high strength, hardness and rigidity to -40 C. Typical applications of POM include high-performance engineering components such as pinions, spectacle frames, ball bearings, snowboard fixtures, fasteners, firearms, knife handles and lock systems. The material is widely used in the automotive and consumer electronics industries. Package Included: Guide wheel*1