The Shimano Cassette CS-4100 11-42 10 Speed is a versatile bike cassette designed for use with Shimano's Deore groupset. With a gear range of 11-42 teeth, it offers a wide range of gearing options for tackling varied terrain. The cassette is designed with Hyperglide technology, which ensures fast and accurate shifting even under heavy load. It's made from durable materials and is built to last, making it a great choice for riders who put their bike through its paces. The Shimano Cassette CS-4100 11-42 10 Speed is easy to install, and the lightweight design helps to keep the overall weight of your bike down. Whether you're a recreational cyclist or a more serious rider, this cassette is an excellent upgrade to your bike's drivetrain.