Welcome to our store！</br> 1、Aluminum Alloy: 12 speed cassette is made of aluminum alloy material, which is suitable for various harsh riding environments. Anticorrosion, good heat resistance, and long service life. 2、Smooth Rotation and Noiseless Operation: Bicycle freewheel provides smooth rotation and operates quietly, enhancing the overall riding experience. 3、Accurate Internal Thread: The high accuracy internal thread ensures a tight connection with the bicycle hub, improving stability and power transfer. 4、Hollow Design: Helps to reduce weight and alleviate the burden during cycling. It achieves a good balance between strength and weight, making it easy to install and use. 5、Easy to Install: Bike cassette is designed for convenient installation, making it easy for you to replace or upgrade your existing bike freewheel. <p class="wang-edit-text"><p class="wang-edit-text"> Item Type: 12 Speed Cassette Material: Aluminum Alloy Weight: Approx. 839g / 29.6oz <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x 12 Speed Cassette 3 x Sprockets Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>