The Vintage Shimano RSX Rear Derailleur is a high-quality, durable component designed for 7-speed bikes. Made of aluminum alloy, this long cage derailleur features a sleek silver color and is compatible with Shimano brand components. With a bolt-on mounting type and being lightweight at 10 oz, it is suitable for road bikes, mountain bikes, and touring bikes. This rear derailleur is a reliable and essential part for maintaining smooth and precise gear changes while riding.