The Shimano Derailleur Ultegra R8000 11 Speed Rear (RDR8000) is a high-quality rear derailleur designed for road, hybrid, gravel, cyclocross, and racing bikes. Made from durable plastic, aluminium, and alloy materials, this derailleur is compatible with Shimano Ultegra models and features a medium cage derailleur cage length for smooth gear changes. With a sleek black colour and a weight of just 248g, this rear derailleur from Shimano is a reliable and efficient choice for any cycling enthusiast looking to enhance their performance on the road or trails.