Brand new. For:Bike Aluminium Jockey Wheel Rear Derailleur Pulley 11T 8/9/10 Speed. This product is suitable for most 11T rear dials. Please check the dimensions before buying: thickness 10mm, diameter 43mm, center hole diameter 5mm. Material Aluminum Color Silver Teeth 11T Size 5mm diameter Part Type Rear Derailleur Compatible Bike Type Mountain Bike Number of Speeds 8/9/10 Speed Bearings Upgraded RS Bearing Brand Unbranded/Generic MPN MEM08415774853 EAN 0608415774853 Brand Unbranded/Generic MPN MEM08415774853 .