Size and Material: Each bearing measures 24 x 37 x 7mm, crafted with a hybrid ceramic structure integrating Si3N4 (Silicon Nitride) balls for reduced friction and enhanced durability. Model Compatibility: Perfectly fits models requiring 24377- bearings, including hubs and other cycling applications. Enhanced Performance: Designed to deliver smooth rotation and high efficiency, these bearings reduce maintenance needs and improve your ride quality. Durability: to and wear, these bearings are built to withstand harsh conditions and provide long-lasting performance.<br><br>Specifications Model: 24377 Color: As Shown Structure: Deep groove ball Material: Metal+ceramic Size: 24 x 37 x 7mm Seal: Rubber seal ()<br><br>Package Contents: 2 x Bicycle Hub Bearing<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.